I'm not sure what your issue was, but I've used ventoy across 5-ish computers and with multiple OS'es (various linux distros and win10) and never had an issue. Did you file a bug report or find out what the issue was?

Same. Ventoy has been pretty awesome for me. I like to have options for if a friend wants me to set up and show them one of the simpler distros, or if I'm at work and I need to re-install Arch (or just boot the ISO and fix the existing install). Way better than either bringing multiple thumbdrives, or having to just pick one OS to be able to have on the go, and rolling with it.

Have you tried it on different USB dongles? There are notoriously crappy no-name ones that fake their capacity or have other problems, but once in a while also legit ones can fail in strange ways: I had this branded USB key bought in a regular shop that passed all data integrity tests but refused to boot. I had bought 3 of the same model the same day and the other two worked fine, but that one would never boot, no matter which image i would flash it with; I never discovered what the problem was, and the dongle still works fine for other uses. So you may want to test other dongles to be sure.

I don't know how you managed not to be able to make it work. I've been using it on dozens of pcs, never had any issue.

Was secure boot on? That made it not work right for me as well

It works great in practice for me. What issues are you running into?

Also great in practice.