I wasn't too bullish on Deno because of the lack of a good package manager, but now I'm excited about JSR as well, it's cleverly architected, and everything in that talk made sense to me
That's understandable... I actually kind of appreciated the use of HTTP(S) references for code with Deno.. though a repository is nice enough. The x.deno.land worked, but JSR is definitely a better longer term solution, and really happy to see decent npm support.
Thinking about a minor rewrite of a couple modules this weekend to be JSR first, adding enough for an npm publish to remain working.