As someone from Gen Z myself and who has 3 siblings in Gen A, I sometimes play Roblox, Minecraft, etc. with them, but find myself ultimately returning to SL way more because of its creative, social, and technical capabilities. It is truly like nothing else.
I believe some in Gen Alpha are like me, who grew up being able to access technology and found themselves immediately joining virtual worlds. If they aspire to those kinds of environments, some will simply find the "limitations" of how "easy" the UI is, settings, etc. of games like Roblox and Minecraft to be all they want, while others are like me in that they wanted something more to accomplish.