The non-rabbit hole professions like fireman, stylist, lifeguard, etc., are pretty time consuming, and I think it would be very hard to manage a household with more than one sim in that type of job, so I would agree with your approach. In fact, I've only really enjoyed playing a sim in one of those professions when they've lived alone. It's tolerable if everyone else is either at a rabbit hole job or in school during the same hours the fireman - or other professional - is also working. Self-employment, however, is an entirely different matter. It's pretty easy to manage several sims who are self-employed (painters, gardeners, writers, etc.) because you need to follow them less. You can just queue up activities for everyone and check in on them once in a while.
