Well, it is a 'selective debunking' at most. I mean its actually another of those endless dimensions where people's preferences play a strong part. While I doubt there are too many people who think having one PC take center stage for several sessions in a row is a great idea, there may be some who think its OK if its for one part of a session, or an encounter, etc. Personally, I'd say that an ideal game would say "well, you can have the spotlight at ANY time, if you wanted it bad enough!" and then naturally make it easier to get in situations that match up with your archetype. So, a thief probably shines when sneaking around and stealing stuff, but the fighter might pull a super sweet move, if the player is REALLY sold on this being his moment. Now, as to if you can design a game that consistently does that... 5e probably isn't it, lol.Firstly: I see what you did there. (Bolded for emphasis.)
Secondly: it is incredibly refreshing to have someone, ANYONE, try to debunk the idea that spotlight balance is the end-all, be-all, cure-all technique. Or even admit that it could ever be faulty. I've had so many discussions where folks will just refuse to engage AT ALL "because spotlight balance."