Sigh, done in by the pig teammate............

I agree, I understand that you need to be ruthless to get the throne but if he did as WY wanted then how would he be better than TZ and the current emperor, at the drop of a hat willing to sacrifice people loyal and sincere to them to achieve their goals. This may be the most secure path but if there are ways to act without damning so many innocent and loyal people then that's better. As you said, he has a responsibility to these people and this makes them weaknesses. He needs to have more advisors with whom he can honestly discuss WY's plans and who understand his obligations to these weaknesses.
Maybe I'm soft to think so but there are somethings that you should not sacrifice (or at least you should seriously hesitate to sacrifice) for power or life because after doing it once it becomes easier to do it again and again and again, and eventually you give up something so essential to your humanity. As a person I want heroes I can cheer on, I need heroes that can be ruthless but not those utterly lacking in morals because when I read I disdain those kind of people- and I refuse to make an exception to these priciples just for my MCs. It's one thing to understand why mcs take such and action and sigh at their need for it, it's another thing when you feel there might have been an alternative but the mc was too impatient to consider that.

That said, I understand that every moment the Jiangs are standing there is a chance for a turn around. Even so I really can't condemn TY for keeping faith with his followers by not wanting to sacrifice them. And I say this because the reason I dislike TZ so much was because he didn't keep faith, WY helped him giving her all but in the end he cruelly killed her without consideration not just because of LCL's pleading and wanting to sate his humiliation but also because I bet you he felt it would further appease the Jiangs and keep them on his side via LCL. And WY was just one person. That being the case how does it make sense to blame TY for not making a similar decision but this time with thousands of lives? Whether for the sake of taking power or keeping it.

Of course people might disagree because if TY doesn't win all his supporters might lose their lives anyway so he might as well preserve some at the cost of sacrificing others. Anyway, TY needs to start contesting WY's plans not just listening to her, hesitating and then following her words in the end. He needs to understand why she chooses certain paths, what are the real consequences to these paths, what he stands to gain, what are their alternatives, can they be tweaked to suit his morals and so on. That way next time decisions like these come up he already understands what he needs to sacrifice and why- he can reconcile his emotions, make psychological preparations, steel himself and make sure his conscience is ready. She's an advisor not his mother, and as a future emperor he needs to be ready to get rid of all this damn vague talk and find a way to balance his goals with morals. Being decisive when needed and benevolent when needed, but never doing either halfway or doing them heedlessly and without consideration. It will not be easy, it will never be easy but he should just suck it up if he wants to be the best emperor he can be.

Nevertheless, I can't hate him or even chide him for his hesitation but maybe that's because I'm not in such a tense and urgent situation so I'm more chill.

To be honest, Touba Yu is idiot. All of your points are just that. No matter which lifetimes, the one that will ascend will be those like Touba Zhen. It already been alluded that current Emperor also rose the same way as Touba Zhen. Wei Yang simply wanted to help Touba Yu with his weaknesses. So what if he sacrificed part of his people. The one landing the blow isn't him, unlike Touba Zhen. Even if Touba Yu ascended, his humanity and compassion won't loose, because that is what makes him himself and also why Wei Yang choose him. Even if Touba Yu become emperor, he won't force Wei Yang into his harem precisely because of his compassionate heart. Don't be unrealistic, without Wei Yang, Touba Yu would have long died in Southern Xinjiang. And now he wasted so much effort of Wei Yang. Tbh, I just hoped Wei Yang to stop helping him. For sure, he will die without even knowing it then. Dreaming to trample Touba Zhen while still staying "morally upright"? Yeah. Such a big dreamer.

If TY can't do it, he should have just been honest to Wei Yang since beginning! Too much trouble, Wei Yang had to plan everything, screen those people that can be buy or not, and exposed her cards in front of Jiang Hua, again! And voila, TY spoiled it again! Honestly, at this point he should forthrightly told Wei Yang "Thank you, I will listen to MY advisors only from this moment". No conviction to be Emperor, troublesome birth mother, too much a pacifist. Didn't he just saw his 5th brother died in the hands of TZ, CP and JH??? He still had a soft hearts here? The chamce is that he will lost half or not a quarter of her supporters, but if he lost, all of his supporters died!!!