First of all, X is not a security nightmare. There were 0 cases of someone getting hacked because of X exploit. It’s a FUD.
Now Wayland is a fad (haha). It’s not that much better than X and when it was drafted 10 years ago everyone just ignored it. Over the decade it became clear that X is stuck and at some point it will become obsolete so people started looking at alternatives and Wayland started getting some traction. Over time different tools started getting Wayland support, some people started getting exited about it and a kind of new meme developed where using Wayland meant that you’re ahead of everyone else (just like using Arch BTW). In the end it’s just a nice PR stunt. Ask people what specifically is so great about Wayland and they will mention some obscure features most people don’t need and features that it will have ‘soon’. In the long term the move will hopefully be a good thing but as of now if you don’t specifically need the few features it has you can keep ignoring it.