They are probably not, if we want to be resistent to censorship and law enforcement. Mints work with a centralization idea mostly, thus the more centralized the better the anonimity set of users, the more the idea of "scalability through not-LN-usage" is realized. The issue is that the bigger the mint, the more the risk of:

1. Being rugged

2. Being hacked

3. Government intervention through various means

True, if a custodial service exists, better ecash than nothing...I'll buy that. But a generalized move of bitcoin users to centralized mints creates a huge unforecastable risk.