This is not really a specific comment about cybran land hq but about the changes in general:
Firstly imo hq's should stand out. They are incredibly important buildings but the new hq's don't stand out at all. While the old hq's looked kinda scary and imposing (cybran) or more elegant (aeon t3 land) the new ones just seem very bland in comparison. It doesn't help that the new hq's look extremely similar (or are the exact same?) as the old support facs since after having played 5000 games with this look being the support fac it now all of a sudden is an hq.
The old hq's were also way easier to notice at a glance because of these features, which is important as a gameplay aspect as well. I have a way harder time noticing an hq now.
I dislike the more minimalistic support fac design because imo the smaller sized factories just look bad and off in a way. The air support facs in an air grid look out of place because they look so small. The aeon land support facs lost their nice circle shape and the cybran land facs became hexagon shapes. They all just look kinda squished (even they don't necessarily are) and it feels like they all lost nice details and in general just look worse imo.
t2 air facs are the best example of this imo. It just feels like it lost tons of nice detail and as a result looks more boring/bland.
I guess this is partially because i'm biased towards the old look since i'm used to playing with it but i still feel bad about the (imo) reduced quality of these structures, especially since i never noticed any issues with it so to me it feels kind of unnecessary.