Rebuilding the Death Stars is less of an issue because Star wars has always been Space Opera stuff (basically a fantasy story set in space). The genre works fine and well when it stays within its limitation. Once you try to add the actual hard sci fi stuff to it (novels that go into details about how tech works etc) then create massive issues because nothing else is operating that way.
Hence why the kamikaze scene breaks the internal logic of Star Wars and upends all the other movies. They’ve had the technology to shoot each other with Faster Than Light projectiles for centuries but didn’t because reasons. We all accept that its kind of a thing that doesn’t happen because of reasons and spend time having fun with light sabers. Once you add that element to it though, you have to go back and ask wtf is it these guys have been doing this whole time.
Hence why TLJ breaks the internal logic of war that Star Wars created. It has this weird contrived rules that don’t operate under any logic or scientific scrutiny. Bringing that in was and is a massive mistake.