I have had major problems, because I am also forced to use WSL. The network situation is the largest problem. Colleagues have had random time differences in WSL causing even TLS to fail, because they were 15 minutes in the past.
I have had major issues, and I think its only because of WSL and wouldnt happen on native Linux.
I do have some bugs with Insomnia, for example with the oauth configuration failing. (I think it has something to do with some variable there failing) You can workaround that by just removing oauth, and configuring again, but its annowing.
I still like insomnia overall tho.
Java is not really slow, if implemented well. This is just a reputation it has gotten.
Should have still used them. It was harder to read this way.