Ahh. Now, I got you. I think, that would be an interesting feature request for @GL.iNet; when the SSID is changed also change the hostname.
By the way, one more top tip: In LuCI, at the top right, after changing something, you get a button ‘Unsaved changes’. With that, you see the UCI commands. You can copy those. That way, you get all the commands and need LuCI only once. You could reset your GL.iNet, install just SMB and DLNA and issue those commands via SSH. Of course, a bit clumsy but a workaround.
That is the question. It is good to report it, for sure. The question is whether GL.iNet did not know, well, the question is whether GL.iNet can really do much about it. I have not looked into all areas of their image but reducing the size might be more complex than we think. perhaps GL.iNet can comment on that.