Darcs & Pijul as the Patch Theory-based approach eliminates an entire class of merge conflicts which make working in a distributed manner more feasible. These DVCS have good (subjectively “better”) foundations & need better tooling like forges—unlike Git that already has a ton of things to choose from.
You don't need to, Jujutsu[1] gives you most of mercurial with some additional stuff. And relevant for this subthread, Tangled appears to work with it[2].