Checks at the root level are likely to be implemented in the near future. Freedom and LP, as well as the repo.xposed.info/module/com.devadvance.rootcloak2
Even if your bootloader is locked, Flashfire can still install Xposed.
Even if I wish the Xposed Installer will revert to its old installation method, I wouldn't hold my breath because it seems to be a relic of the past.