Yes, and I just realized one more - see below.
I'm not quite sure how you're arriving at this conclusion, but...OK.
One other very signficant difference between my system (or normal 1e, for all that) and 3e is this: in my system you're putting xp into a class before you level up in that class - the end result clearly matches the process that got it there in that xp put into class A as I go along result in a bump in class A once I get enough. In-game, the character is consciously trying to improve a specific set of abilities (class) and the xp total meta-measures that improvement.
In 3e it's not until you bump that you're forced to retroactively (!) decide where that last level's worth of xp was actually going. I'm a Ranger 8 and just got my 9th - and only now must I decide whether to go R-9 or R-8/Cleric-1. I've been earning xp, sure, but not in any particular class: the process and the end result don't quite match in that those xp could, when I bump, retroactively go into class A or B or C or wherever. In-game there's no process required of the character (though some DMs did houserule that you had to declare at the start of each level where that level's xp were going), just a meta-choice on bumping as to what class to put that level's worth of xp into.
Just on this, 3e = way more meta.
Lan-"and the above is true for single-class characters too"-efan