Baker,
If a person wants to play Quake "as it was" on his CD on his Windows 8, then he will be helpless.
The game will not even install without some tricks. And even then you will be far away from running it.
So, if a person who wants to play his Quake from CD, he will type into google: "
install Quake Win8"
And then: "
run Quake Win8"
He will then most probably end up on sites like this or quakeone or func or steam.
If he ends up on quakeone, poor guy he will be bombed with bling bling stuff which is not Quake anymore.
If he ends up on func, he might find the help he wanted.
If he ends up on i3d, he will not be able to ask because of registering issues

Anyhow, a person who wants to play Quake from CD needs others to help him.
Depending on which community he ends, or wich sites he visits while searching, he will also be informed about "other" things that has been developed for Quake.
He will be happy to find that there are advanced engines that run smoothly on Win8 (this seems to be the actual Windows version, as I have heard of).

===================
Back to topic, and comparing FTE with other engines:
I think we should always consider what a universal engine FTE is.
Almost a handful of games is running with it, that is already remarkable.
I admire Spikes efforts to create an engine that can handle all of them.
Therefore we should not judge it the way we judge engines which are made and tuned especially for 1 game.
There will always be slight bugs or issues with individual games in FTE because of that, but the overall performance and features are simply outstanding, when keeping that in mind.
I remember Spike saying many times that he has to be careful when implementing one request from an individual to keep his engine comparable to the other games with it.
Yes, FTE might have some small issues here and there, but the complete package it delivers is simply outstanding.
And Spike is working hard on killing the bugs (as long as people report them).
Thank you Spike !