Ok, I thought having you do the math might make my point. I'll walk you thru what I'm getting at.
Multiple attacks split dice pool evenly.
Wide burts split dice pool across two targets.
Different flavors of the same thing? No. Not when you combine them, at least.
Runner holds an Uzi and pop-pops a multiple attack on two targets (SS mode). Split dice pool "evenly". If the dice pool is evenly divisible by the number of attacks, ok no problem. What if it's 13 dice across 2 attacks? Evenly is 6.5 dice per attack. It's impossible to roll 6.5 dice, so you have to either have 2 attacks at 6 dice each (losing a die in total) or have 1 attack at 7 and one at 6 (i.e. not even). Which is it? It doesn't look very clear cut to me. And that's before we really even force the two rules to try to cohabitate.
My example was multiple wide bursts. Ok so as above, but we're now also giving half the dice pool to each target of a wide burst. If I do 2 wide bursts with 12 dice pool, that's 4 attacks on 4 different targets that each get 6 dice. That doubles my original dice pool even without factoring in Anticipate. It gets downright headache inducing if you double up and try to spread X attacks across >X targets. If the first wide burst targets gangers 1 and 2, and the 2nd wide burst targets gangers 2 and 3, how many dice are you rolling at ganger 2, across one or two attacks? Because frankly what ganger 2 suffered by all rights ought to be a narrow burst. Narrow and Wide bursts have different -ARs and +DVs, so it matters. Ugh.
So, I expect you'd say "no, half doesn't mean half the total, it's half what you assigned after multiple attacking, obviously". Ok, so what's the citation to support imposing that timing? How do you disprove "evenly split between two targets is total dice pool/2"? Me... I'd say that if you put half your dice pool to EACH target of a Wide Burst, then that's pretty strong circumstantial evidence you're not supposed to be able to multiattack wide bursts. And if you can't multiattack wide bursts, why can you multiattack ANY burst?
My point here is this: saying "you have to split for multiple attacks, AND THEN wide bursts only split that already split pool/subpool, not the total pool" is adding in a rule. And that's doing more than what SRM did by saying "these rules don't have very much overlap on the venn diagram".