I helped swap a mess of ClearCase & Subversion over to git (early 2010s). What a fucking cursed piece of software!

Will admit it got exactly one thing right, which could absolutely justify everything else (including the price) for a long time: Software Bill of Materials, which is non negotiable in a lot of more serious/heavily regulated development contexts

That still didn't excuse the hacked together pile of ruby scripts our QA lead maintained, each one designed to unfuck a specific weird thing clearcase did. Once everything was on git, they just wrote another script that grabbed a bunch of tags from git and shoved them into clearcase to spit out the bom.