I think if you are a pro then you would fall into having some very top end glass suited for what you do mainly to get paid. Unless your a pro for wedding, sports, wildlife etc but what I've seen is most pro's specialize in one area and use just a few for that main area.
For a hobbyist we may one day want wide, fishey super zoom, prime, low light, etc. I find that hobbyist gear lineup can get pretty extravagant.
Personally for the average amature that I am, I think you can get away with a good 4 lens kit
Short/wider zoom (17-50, 17-40 or 24-105)
long zoom (70-200, 70-300 or 100-400)
short prime (indoor lowlight anything 50mm or wider)
long prime (portraits here 85-135mm)
I would thing that 4 lens setup would cover 95% of your photography. If you have more than this then it's purely a want to have something a bit more unique or creative. Like my 8mm fisheye. I don't really use this lens much for showing off but more as a memory tool. I can really create a memory of where I was at and see the whole thing as if I was really there.
Don't forget macro too. Realistically anything more than maybe 6 lenses then you are treating yourself very good.
A7rIII | A7III | 12-24 F4 | 16-35 GM | 28-75 2.8 | 100-400 GM | 12mm 2.8 Fisheye | 35mm 2.8 | 85mm 1.8 | 35A | 85A | 200mm L F2 IS | MC-11
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