Carrying around lots of USB sticks would be bulky, but somehow I expect it to be more reliable than Ventoy - my experience with the Zalman ZM-VE350 has never been reliable enough to replace an external CD drive. I wish there were a bundle pack of USB drives with installers for all Windows and Mac OS versions, so I could just pick out the right installer and install. As for why you'd want various Linux distros, I imagine it's a similar platform-sensitivity issue. Some only boot Win10, others only Win7 (圆4 or x32), and the oldest only XP.
Linux is the only consortium of operating systems that still suffer from the inability to. I regularly find old laptops in the trash, and friends like it very much when I repair them and give them away. OS X will work on any hardware it is permitted to operate on.
I've tried using DiskMaker X, as well as using Disk Utility and. However, before I install Mavericks, I want to make a bootable USB drive. The laptop has a 2 TB drive, and a lot of legacy software just in case I need to open some obscure file (e.g. I've just downloaded Mavericks, and am now in the process of backing everything up and doing software updates before I begin the installation process. It's been useful to boot into WinXP to play AoE or WoW, or Mac OS 10.9 to run p0sixspwn to jailbreak an iPhone 4S.