If Luke Cage or Jessica Jones lost some of their edge in the transition it would be a great loss.
There are plenty of PG-13 heroes out there, but the ones for a more adult audience are more limited.
Going back and forth between the two tones would be odd and would likely be difficult to pull off well.
Fans of the various Netflix shows are fans of them as they are, so seeing their favorite characters on the big screen might be great, but it’s likely that fans would be annoyed at seeing a PG-13 version of them instead of what they were used to.