Based on,No signal after booting fedora workstation,on rasp pi 4 - #18 by yewefed0ra
It seems to me that there are some drivers/touch display which are not supported by fedora workstation for arm?
Although I am not sure if the problem is ARM specific or not,I hope the documentation can help future users having the same experience as me.
If the supported display changes often and is hard to list I dont mind it link to a source code class or enums which we can easily refer.
Thus I decided to ask here for help to update the docs in for example,Architectures/ARM - Fedora Project Wiki