Probably could be more diligent with planning and charging while using near a desk, but that adds mental overhead for very little gain. Her time and mental capacity is best spent towards focusing on her extremely high stress job. The entire point of apple ecosystem is to not have to think about it.
I rarely use the 80% feature of my iwatch since I have no idea which day out of 30 or so I actually end up needing that last 20%. Not worth the extra battery towards end of life since I will very likely be trading in and upgrading by the time it’d ever be useful to me. Even a single day of not having a dead watch offsets the cost for me.
YMMV of course!
Biggest downside I've found is around recording calls. I'm sure there are ways to do that with VOIP, but I've found it easiest to just use my cell when I have the occasional call I need to record.
People still use voicemails? Do you have a fax machine too?
In the context of a job where you're heavily using phones in the first place, yes.