As an IT professional I will always advocate for readable, shareable and trackable configuration files.
If the change to UI-only configuration means the removal of these capabilities (which is my understanding of the post), I will review my continued use of this platform.
I understand that YAML isn’t newbie friendly for a lot of people (and don’t get me started on templating), but UI only will be just as unfriendly to a section of the current userbase.