Artoomis said:
Ah, but if the Haste Partial Action is part of your "total round" then spells that take a full round to caste should STILL take a full round.
Nope. You are effectively speeding yourself up so that you can accomplish more in the same amount of time. It doesn't extend your round. You simply get faster.
Having the opinion that Haste extends your round is bound to completely jack up your perspective on how actions relate to one another within an given time frame, yada yada yada, etc, etc, etc...
You could argue against me until blue in the face but nobody has come close to defeating this logic. Besides, it works for me.
So, to clarify by referring to your previous three points, if haste simply makes you faster, then...
1) You are still limited to one 5-foot step per round anyways, so there's no argument there, well, at least not a decent one.
2) This still doesn't fully explain the charging thing, but I don't know that anything will.
3) Taking less time to cast a full-round or longer spell makes perfect sense, especially if you view haste as speeding you up and not simply "adding another action".
Anyhow, that's my take on this whole thing.