There was a time not too long ago when hearing this was rare. For about a decade, it seemed that every big action movie that has come out has been given the PG-13 rating. The disturbing thing at the time was that a lot of the PG-13 films have come from R rated properties. While these are not first time occurrences (Mad Max Beyond Thunderdome was a PG-13 film in an R rated franchise that came out in 1985), it did bring about some glaring issues. For one thing, there are obvious bits where the violence has been watered down. Also, a lot of the action scenes have been filmed with quick cuts and rapid movements which make it hard for the audience to make out what is happening on the screen.
The worst thing about PG-13 films is that they came at a time when Hollywood was starting to become gimmicky. When a film happened to be successful, Hollywood wanted to copy that film over and over. For instance, the Batman Reboot films have led to other properties being rebooted. While the first couple of reboots like Batman Begins and Casino Royale were good, there were tons of reboots that were disasters.
These past 10 or so years was like the Hayes Code era of films. Now, Hollywood has calmed down because it has realized that it is more important to tell a good compelling story than to cater to a rating. Even Disney can be trusted to leave the Deadpool franchise alone as the R rated portion of the X-Men franchise. The only issue is that it might be going to the other extreme where everything has to be rated R. For instance, studios seem to be on board for an R rated Quentin Tarantino directed Star Trek film. Since the success of Deadpool, John Wick, and Logan, Hollywood has seen that there is a market for R rated films that is perhaps as big as the PG-13 market.