With tools.deps and the need of some companies for more advanced build setup a lot of people are actually thinking about these issues.
But I'd be surprised indeed, I'm not watching the whole clojure space closely, I can only say that no one hit the #leiningen irc channel or posted something on the bugtracker/proposed a PR yet.
And the client/server model.. sure, nailgun and grenchman were a bit clunky, but none of these efforts have gained widespread adoption, afaik. Most people don't just go out of their way to tweak their build tool.
I was not thinking about these two, nor was I thinking about a patch for boot/lein.
That said the slow startup issue is only really valid for cli apps (and maybe CI), if your dev workflow relies on re-starting your repl all the time, it's a broken workflow.
Developing in a repl is nice, but it's not the only allowed or legitimate or even good way to do development in Lisp or other dynamic, interactive languages. Clojure has an issue with slow startup (another tradeoff made for good reasons that don't fit everyone's situation)--denigrating other people's development approaches doesn't solve that, it comes off as defensive.
Me neither, and I also carry decent Lisp cred.
I know what I'm doing to the extent that I can write a bunch of code in a file, and have it work, more or less.
If I experiment with changes to code, I want to see the diff (as in git diff).
Actually developing in a REPL seems very scatter-brained; you don't know what you're running since you've been mutating things left and right.
Those that develop in a REPL actually develop in some kind of text editor which sends expressions to the REPL; that's what allows them to save the code properly to a file. Problem is, you now have three versions of the code to keep straight: editor, file and image.
Okay, so you have massaged things into working. Well, which is the code that is working? Obviously, the code that is in the image. But of the textual codes does it correspond to? If you just save the content of every edit buffer to disk, is the code on disk exactly that code that is working in the image?
Even if I have to work with a running image (say there is a lot of state that is difficult to reproduce from a clean start), I'm still going to work with some files, which I will edit and completely save to disk, and load all together as a unit into the running image, instead of evaluating individual expressions out of an edit buffer.