It was kinda my point - they're capping the only buildings that are self-limiting. The first few buildings make the biggest difference, but very shortly afterwards it becomes pointless to build any more. Now instead of that calculation of whether it is worth it, you just can't, because reasons.I've never tried it, because I'm a bit of a role player and I like to keep things realistic, so I limit myself on stuff like that. But I quite easily get to 25-30% nobles which I already find it difficult to justify by paying just a bit of gold compared to all the benefits it gives and I have to tell to myself to stop building libraries or I'll ruin immersion for myself.
Alternatively, the building you're most likely to want to build in your city with 17 Tax Offices is another Tax Office. Yet they're uncapped.