I recently submitted to the Ventoy path, can't believe it took me so long.
I actually thought I had messed something up after burning it on a USB. The drive mounted an empty folder and I thought, "no way it's that simple, I don't just drop the ISOs into the folder do I?"
Yes, you just throw all your ISOs into that folder, unmount, and you're good to go!
And you can even go a step further and configure it so all the ISOs go into a subdirectory. Then you can still use the USB for other stuff without it becoming a mess. Right now I have the following structure:
├ apps // Lots of portable apps, using the PortableApps system
├ data // For copying files between devices
├ images // ISOs go here, separated into Linux, Windows and Utilities
├ installs // For apps that need to be installed
├ secure // Encrypted Veracrypt store
└ ventoy // Ventoy config
All that on a tiny USB on my keychain and super useful when you're the IT person for the family.