The ability to try live sessions and dual-boot made a huge difference to the average users willingness to try desktop #GNU/Linux. If it didn't work, or was in any way unsatisfactory, the user could be confident their PC would still work under Windows. If there was a way to test custom ROMs for mobile devices, like #Replicant or #LineageOS, without affecting the default system, I suspect a lot more users would be willing to try them.