Only thing I've read about invasions in Elden Ring is that they can only happen in co-op because you can't be mounted during co-op, which sidesteps an issue I had considered when they first revealed the game was open world with mounts: "How's an invasion gonna work in a huge open world where a player can just mount and ride away from the invader?"

Anyway, personally I won't miss being invaded (which i won't be, as i don't play these games co-op), since 99% of the time you'd either get an invader with a pure pvp build that'd wreck you easily, or a random newbie who just hides behind enemies all the time. Neither are very appealing to me.

That said, I guess ideally they'd find another way to sidestep the open world/mount issue and give solo players the option to be invaded or something