Oh, you're wrong. It does! That's because if the price appreciates on the 2nd market, then it gives the artist an ability to sell new works for a higher price, as there is more demand for them. Sales drive more sales.

Btw. I meant, only buy NFTs that were produced directly by the artists themselves, and the artists have rights to their work. Basically, avoid middlemen. That's what crypto is for.

Artists are able to determine the cut of resale profits they receive, aren’t they?

There is nothing in ERC-721 to permit such a requirement.

Centralized marketplaces for the resale of 721s (NFTs) can enforce this for sales they arrange, but there's nothing inherent to the blockchain or NFT to require it, which means that sales bypassing such centralized marketplaces would not be subject to those conventions.