Where is the forced choice here? Who said that summoning is a forced choice, but chaos isn't?

Summoning has one synergistic spell. Well, maybe one and a half... Chaos has 6-7. Do we really need to comment on this?

A Berserk under
Enchanted Rain is an even more terrifying
thing than Meteor, but that's not a
reason to give Dark magic a profile.

I don't argue. But Dark magic doesn't fit the lore at all, while Chaos does. It's only slightly inferior to Summoning in this regard, if it's inferior at all – after all, an elf elementalist, for example, would look a bit strange. But an elf earth mage would fit perfectly.

There are many spells that work with Enchanted Rain,
including Chaos spells, many of which
appear in guilds of levels 1-3.

But without the skill, there will be no post-effects. No stuns, no freezes, and they won't even deal much damage. And before, it wasn't particularly effective without Elder Druids, and now it's even worse without the skill, without Chaos specialists with a reduced set of spells. No, I don't think so...
However, okay, I've started a pointless argument here. If people want it, let them have it. But I don't see the point, seriously.