[bluGill]

Because you never wrote it. The curse of open source.

By the time github came about, git already had a lot more mindshare than hg. While hg wasn't yet clearly an also ran, it was clearly the less popular solution, and many open source tools started supporting git but either not supporting hg, or if they did it was an afterthought and often the maintainers broke something hg without noticing and then releasing with broken hg support.

[zabzonk]

maybe. at least on windows TortoiseHg was far superior to TortoiseGit.

just to be clear, i have worked with both hg and git, and can get along with either, but i do prefer hg.

have also written several foss tools - for example csvfix.

[bluGill]

Don't get me wrong, there were lots of great hg tools. However the majority of tools were for git and so the few better ones for hg don't make up.