Tactical advance has tradeoffs though not as severe. And yes, you should be grateful of having the luxury of getting killed just like the Stug has the luxury of taking forever to aim and load a TWP while getting shot at and getting itself killed. No fixing the RE until the TWP gets fixed. Stug got its ability, base stats and pop cap nerfed while RE remains a good unit even without volley.
Tactical advance does what it advertises. Volley fire does not. TWP is a separate issue unlinked to an underused unit with an awful ability. Soviet tanks have fucking cap territories regardless of its intended role so at least be happy TWP has a job, even if it was over nerfed. But again REGARDLESS of other abilities volkey fire sucks and needs addressed. It could be removed and wouldn't be missed and that is a sign of an underpowered ability. The fact that RE are unattractive to begin with (unlike the stug) makes it even worse. An attractive unit with a decent ability is at least serviceable, an unattractive unit with a worthless ability might as well not be...