Yes. The little word "suitable" was doing a lot of work in my explanation, it's true. BK was invented by a kernel developer for pretty much exactly the reasons I explained; I just glossed over the part of the route that went diff+patch -> BK -> git as a detour. I was actually a lurker on the linux-kernel mailing list while all this was going on and saw the fireworks in real time.
It's not exactly accurate to say BK withdrew support. Larry McVoy was such a pain in the ass about wanting to control how people used his product that the kernel developers felt the need to write their whole own solution as opposed to continue putting up with him. (Specifically, his pulling Andrew Tridgell's license for dubious reasons was the straw that broke the camel's back.) RMS actually wrote a sarcastic open letter thanking McVoy for providing a good lesson in why it's a bad idea to let your important stuff be dependent on proprietary software.
But the point remains; BK was invented by a member of the kernel community specifically because none of the existing solutions were usable for them, after more than 10 years of one of the biggest and most-distributed software projects in the world having no source control whatsoever.