Thanks for sharing your feelings, but the cryptographic literature has been around for over 20 years and is well established.

Adding/removing signers isn't so much to do with the FROST signing protocol, but rather the things we can do with the secret shares that FROST uses:

https://en.wikipedia.org/wiki/Proactive_secret_sharing

https://link.springer.com/chapter/10.1007/3-540-44750-4_27

https://github.com/chelseakomlo/talks/blob/master/2019-combinatorial-schemes/A_Survey_and_Refinement_of_Repairable_Threshold_Schemes.pdf

In terms of implementations that we engineer, yes they will require review and thorough testing, which we will achieve.