Yes, with the newest editions of unraid you are really limiting yourself. As long as you don't want to use any add ons, dockers or VM's, you should still be ok though. It's also possible the automatic GUI update may not work for you, but you can still manually upgrade by replacing the files on the USB stick.
Unraid and its capabilities have grown immensely in the past 5 years, it's no longer just a NAS, it's a platform for all things home server. ?