Based on some of the searching I have done on this topic with recent Canon mirrorless bodies, I would not agree that mirrorless does not need micro adjust; at least in the context of using the adapter for older EF lenses. I know that in this case it is RF lens, but I would still want to do a real focus test chart to know for sure the focus plane is proper. Having completed a proper focus test with controlled conditions lets you know for certain that when you see odd focus issues that it comes down to technique or subject movement. But, that is just the way I think and what I do with any new lens or body.
In doing just a little bit of searching I have come across several complaints about front \ back focus when using the adapter for EF \ EF-S lenses. That is part of the reason that I am very hesitant to make the change, as I am not about to try to sell my EF lenses and replace with RF. Now what I am not sure on is if they were using the Canon adapter or third party and why I intend to look into this more.