So are you saying that you're concerned by the lack of a detailed vision for Svelte, or that you're concerned with the behavior of the primary maintainer of Svelte?
My main concerns as a "technology buyer" are (from what I found online with a rapid search): lack of funding, currently only two main committers (the original author not among them), project apparently in bugfixing-only mode, and the original author online attitude.
From an outsiders perspective, that's fair enough. However, Rich's time and focus as well as a number of other maintainers is currently on Svelte-Kit, which gets a commit around every 6 minutes at its peak, and at least every hour otherwise. Rich is ridiculously active.
I've seen some of the GitHub issues that Rich is referring to in those tweets. They're almost always cases where someone is asking for some feature or change in Svelte and the core contributors disagree that it fits with the design and vision of the project.
Then the OP tags Rich in the hopes that he will swoop in and and override the decision. It's almost always more of a tantrum than a real request for help.
As far as project progress, most of the recent work has been on SvelteKit, but I've been using Svelte for about a year now and it has steadily gained features during that time. It's definitely not in bugfix-only mode.