BRD has a low skill floor but by the time you get close to 70 you will be tracking a lot of different things; it can be quite hectic (at least in my experience). It's not as convoluted as MCH or SMN by a long shot (hah) but just keeping track of everything during an active fight can be a bit overwhelming.
If you want low-stakes, WHM is very easy- straightforward to play, tons of raw power, and great at turning around a scary fight. Healing in general in this game is actually pretty easy until you start doing EX/Savage content. There's a few bumps on the road to 70 but they aren't outrageous - if you err on the side of caution and know where your "srs bsns" buttons are you'll probably be fine.
