No, it's totally a thing-thing. Some teams do it more than others, certainly, but teams have treated it as a primary directive since, like, the 2013 Dodgers won the pennant by expanding their pitching staff to 20 guys by regularly rotating them in and out.
The abuse became so universal that the league had to step in and limit the number of times a Joe Smith could be promoted and demoted in a season. But that has only led to more abuse of AAAA veterans who are instead promoted and DFA'd, and regularly end up with four organizations in a single season.
But the good news is that rosters remain largely frozen within a series during the post-season — though there are now injury exceptions* to that rule which I imagine can and will be abused.
*FUN FACT: As with many rule changes, this largely occurred because of the Mets.