Well, there's SonicDE, but like many such projects it's probably maintained by reactionaries which introduces its own suite of issues around security, code quality, and "will this be maintained in a year, 5 years?"
A quick search (in which I found no evidence of heated controversy) suggests to me that it's the first one.
Why is it a warning sign? Sounds very useful to keep X11 support for machines that have no good video acceleration like office computers or stuff relying on VNC protocols.
I suppose you're from the " hop onto the bandwagon no questions asked crowd " then.