For what it's worth, I use Insomnia every day with some pretty large requests and I've never had an issue with it.
With this, VSCode, Slack & Boostnote - a good portion of my daily work is done in Electron apps and I can't say I'm itching to switch to native alternatives.
Definitely appreciate how people have issues with it, but it doesn't seem like it's going away and hopefully will only get better.