There is no such thing as "Bitcoin Maximalism".
People who use that expression are usually just looking for a sorry excuse why their beloved Altcoin fails.
So-called "Bitcoin Maximalists" are usually simply conservative in that they prefer a decentralized, stable, well-developed blockchain as the basis for a digital currency over some random, premined or ICOed copycat with feature-bloat.
Why bitcoin should not support pre-mined tokens or ICO use cases, better than other coins. If projects are legit then what would be the problem ?
Take a look to Komodo solution for example...