What I find odd about this whole thread is that, really, we can and do all understand what each tileset (or lack thereof) represents.
I've run a few threads, now, which have had a wide sampling of different tilesets used, varying from player to player. Not once has anyone complained, or shown any difficulty whatsoever in understanding what's going on.
When one player prefers, say, SpaceFox, they just update the RAWs to reflect that. With LNP (which, I'd wager pounds to pennies, a vast majority of players use), it's as simple as clicking a choice from a list, and then a button. In my current thread, I started the embark with Phoebus. One player prefers ASCII, and posted pics in that format instead. Exactly nobody was confused.
Why is it okay to mod the hell out of everything *except* the graphics used? Whenever a new race/critter/plant is modded in, it requires a symbol to be added - yet, nobody complains.
Is this forum truly so full of fuddy-duddies as to think that others shouldn't have a voice, simply because they have an accent? Sure, sometimes a certain sprite may require some clarification; so what? Sometimes a certain sentence, spoken through a thick accent, does as well. Are we truly so arrogant as to expect an immigrant from a non-English speaking country to have perfect pronunciation and diction, as well?
DF already has enough hurdles to jump, when it comes to growing the fanbase. How is limiting options for players helping with that in any what whatsoever?
If anyone wants to get so purist as to actively attempt to deny players from posting in whatever danged tileset they prefer, they'd best delete DFHack, Dwarf Therapist, Stonesense, Soundsense, LNP, and any other 3rd-party add-ons, mods, or other tools from their own HDDs. To do less that that is hypocritical in the extreme. After all, having DFHack fix the massive bugs in the program is exactly as non-vanilla as using Mayday's tileset to be able to understand what you're seeing while you play.