Even without referencing another (albeit related) game, like Kot says, it's simple logic. Adherence to the rules is important for establishing a good relationship with your players.
Blind adherence to the rules (pun intended, cause it's funny), OTOH, can be detrimental both to the game and group relations.
I did as much word putting as you did, Chaemera. And did so to call attention to the issue, not to try to tear down another person. Like here, (emphasis mine):
LOS is simply a step up from touch, and is inclusive of the previous range (touch).
Wait a minute... does this mean you think that any LOS(A) spell can be cast as LOS, which therefore means it can be cast as Touch?
Because, that's what you said. Since ranges go Touch -> LOS -> LOS(A), and you're arguing that LOS, being one higher on the totem pole, can be cast as Touch, that only makes sense if you include LOS(A) going down the totem pole, too.
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I only said what I said, and did not state, imply, or dance around the other issue you spoke of.
Aside from all this chatter, Touch range has a special relationship with the rules. Simply because the caster isn't touching the target, but the target's
aura. This introduces some interesting rules, such as only needing to get a tie on the attack/defense test as well as granting a small bonus to hit for the toucher. Also, the target can't really do anything but dodge, otherwise contact occurs. I don't think this is explicitly stated in the rules, but it is an important point to consider.