Due to the complexity of DoH and the fact that upstream dnsmasq is not going to support it, they will not implement it out-of-the-box. However, it is only a few clicks away.
Five years ago, this was the discussion about implementing DoT: [Dnsmasq-discuss] DNS-over-TLS
There probably is no right or wrong about DoT or DoH. Certain people believe in certain technologies.
@DL6ER had a description somewhere how to add DoH to Pi-hole with a few easy commands. The guide on the docs currently talks about Pi-hole --> Cloudflare, what is requested here is to support Client --> Pi-hole.