4.0 and 5.5 are losing support at around the same time, so there really isn't
any reason to use 4.0 instead of 5.5 unless you already have it installed.
Whether you prefer 5.5 or 6.0 depends on whether you can stand the testing,
of course.
About nonfree games: that's about the position that I had when I first used
Trisquel. There are a few reasons I stopped playing nonfree games:
1. It does affect others, though indirectly: by playing nonfree games (or
worse, buying them), I would implicitly give a seal of approval to the game,
encouraging the development of more nonfree games.
2. If I make an arbitrary exception for nonfree games, people can rightly
accuse me of being a hypocrite.
3. It can be easy to view games as entertainment/artistic works rather than
functional ones, but this is an oversimplification. The fact is that the
source code performs a function, even if its eventual purpose is
entertainment.
4. If we accept games as nonfree games because their function is not actually
useful, then we come to the question of what software actually does something
useful. For example, would it be OK for KStars to be nonfree, since Celestia
is better anyway? Or is it OK for analog clock drawing programs to be nonfree
because digital displays work just fine? But then, what if it turns out that
one of these programs was tremendously useful for a particular purpose?
5. Similar to the first point, by playing free games, I indirectly encourage
the development of more free games, which is good.
By the way, my exact position on games currently is that the program (i.e.
engine) must be free. The art assets and other nonfunctional game data can be
nonfree, in my personal opinion. For example, I still play The Ur-Quan
Masters and AssaultCube, and I would consider playing any of the original
Doom WADs with a free Doom engine to be perfectly fine (though I don't
because I don't own copies of these games, and I don't have any interest in
them). I do, however, strongly encourage free art, and any game which is
completely free (including all nonfunctional game data) is better than an
equivalent game which is only mostly free (free engine, but nonfree
non-functional data).
If the game data includes scripts, it is important to note that these scripts
are functional, so they must be free, just like the engine.
