i've seen this comment before in lots of different features which are limited by this "100 uses" model:
It would be great if you limited the amount of elements instead. For example, having a maximum ammount of 4 goals simultaneously, or having a maximum of 2 Gannt/ Mind Map views interchangeable between the 5 spaces.
This would highly increase free plan viability and a more profound exploration of this features that could more easily convince free users to upgrade to a paid plan.