I actually consider career even in a FWB/plate situation, because to me it is often an indication of her availability.
The last thing I want when I am seeing a few different women is to have one with too much time on her hands and wants to spend large portions of that free time with me. I don't have a lot of free time myself, so it suits me when I find a few women who are each particularly busy and all have limited availability.
All of the women I have spun long term were usually always professional types with limited time on their hands.
Lots of guys create too much stress and drama for themselves when trying to spin plates because they are trying to spin women who are too available, each vying for the same limited time.... all of the time. This forces guys to lie and make excuses to stave off one to make time for the other... trying to juggle all of the sh*t it takes to see them all, getting caught when slipping or losing track of lies, running out of excuses, drama ensuing when caught, etc.
So much easier to spin 3 or 4 women who are only available maybe every other week or even once every few weeks due to their responsibilities and limited availability. Women who are cool with that schedule are also typically cool with a casual arrangement for their own reasons. Women thirsty for the LTR wont put up with it long, on the other hand. So when they are cool, that also makes it easier to be a little more forthcoming about intentions and less dramatic in practice of maintaining a rotation.
Likewise, I actually consider career less in LTR scenarios. I have no issues with and support a woman pursuing a career at all, but I also do well enough that I don't need a woman to contribute financially in any way. If career isn't a main focus in her life, the other "duties" can take larger priority, such as with family and at home.
But I don't want a plate with enough free time that she wants to start playing house.