It's not something that's confined to design/UX though.
Bring in a new CTO/tech lead and they'll tell you the current architecture is outdated or the code is spaghetti and needs a rewrite in [insert architecture/language doing the rounds on HN]. Bring in a new project manager and they'll want to introduce [insert Agile framework du jour]. Someone has been hired for presumably a lot of money, and if they just go "meh, it's fine, we just need to tidy things up a bit here and there" people might question why they were hired for a lot of money.
Of course, but the difference is that there’s a much higher impact for the users if the design keeps changing. Technical infrastructure is pretty much entirely hidden from the users.
Bring in a new CTO/tech lead and they'll tell you the current architecture is outdated or the code is spaghetti and needs a rewrite in [insert architecture/language doing the rounds on HN]. Bring in a new project manager and they'll want to introduce [insert Agile framework du jour]. Someone has been hired for presumably a lot of money, and if they just go "meh, it's fine, we just need to tidy things up a bit here and there" people might question why they were hired for a lot of money.