I think you need to distinguish the T14 and its Western "4th generation" tanks. T14 supposedly is a PRODUCTION model, whereas the other 3 are basically technology demontrators (particularly the Abrams X). T14's design and features are therefore set, whereas the others will undoubtedly be modified and improved upon if they ever enter production. For example, it's almost certain that the Abrams X if it enters production will have far better protection based on the American value on protecting its soldiers. In addition, I was surprised that you think T14 has the "best" protection! Have you seen what's happened in the Ukraine war?! The T-90, which has a similar active protection system, has proven vulnerable, and the other flaws in Russian weapons should tell you that they are full of exaggerations. If the T14 is so superior, why hasn't it been used in combat? It'd be the perfect opportunity to showcase a Russian "super weapon", but instead they're afraid to use it because they know it's a paper bear.