Admiral Grigorovich frigates were basically cancelled because they used Ukrainian gas turbines. Admiral Gorshkov frigates have been delayed like heck partly because they had to replace the Ukrainian gas turbines they used, and partly because it took forever to fix issues with the AESA radar and new battle management system. Maybe. Just maybe they solved those problems.
There is no indication Lider would be more of a disaster than the Admiral Gorshkov program was. They already have nuclear propulsion available.
I think the Slavas will only be removed from service after either the Project 22350M or Lider become available.
The PAK-DA prototype should be under construction right now and will be necessary as a replacement for older aircraft.
If they had the PAK-DA available on this war they wouldn't have needed to spend as much money on stealth cruise missiles.
They will have the Su-75 so they won't need the J-35.
The T-14 should have entered mass production late last year.
but basically, at what cost? if Gorshkov was a disaster with their mini-AESAs imagine the issues they'll have with Lider. Nuclear is more expensive, not less. Kirovs were already so expensive that they scrapped all but 1 while allowing their conventional Slavas to keep serving despite being older.
PAK-DA is great, if they have the munitions for it. But they're still dropping dumb bombs with Su-34s. If they have PAK-DA and are still just dropping dumb bombs with it, what's the point? They'll still have to fly low into MANPAD range and losing a PAK-DA is much more devastating than losing a Su-34 or Su-25.
Basically this conflict has taught us that Russia has to get its procurement priorities in the right place. It doesn't have China's budget yet it is trying to match China in every new project category.