No GUI I believe turns most off as the install is done from command line.
The PXH 2.0 image is not a desktop image which is may be what many struggle with. A desktop install adds many things which slow down a PI thus rendering older PIs to slow to perform
A couple of things to consider:
How many people that installed via command line knew what they were typing? How many people actually know what "sudo" stands for?
IIRC, you can have the desktop installed making it easier for a ton of people then still boot to the command line. Now you can type 192.168.1.xxx from a PC, tablet, whatever and not take a performance hit. If the desktop isn't being utilized I don't see where the performance hit is going to be. It does take more space on the SD card but that's not significant.
I personally feel that you will get a lot more users if you take the GUI root, especially if on a 3B+ which is just a few dollars more. Who cares if it doesn't fit inside a CM15A. You have ETH,wifi,BT, 4 USB ports, more everything. This is why as bloated as Win10 is, or the latest Mac version, they're still the desirable OS systems. Why is there even a NOOBS? Because of the pushback from all the users that didn't want to deal with command lines. If that were the case I would still be on DOS, DRDOS or CP/M.
Of course, you can still boot and run command line and hopefully slowly learn the commands. In general, this isn't a young bunch of people you're dealing with on this forum, hence the hesitation. Serve it as eye candy and they will be eating from your hand.