Casting 2 spells (not a spell and a cantrip) a round at low level is just overpowered - in the iterations of more modern D&D I played (WotC 3/3.5 + PF 1E) this has been a high level ability e.g. Quicken was spell level + 4 or thereabouts ...So simply not possible at lower levels.
I think the 5E sorcerers metamagic quicken is crazy ...I assume in TT it works (sort of) because you can't long rest willy nilly. But they really should have attached a cost related to spell level (so Larian are being sensible I think from a balance view..odd, they ignore it in so many other places). Clearly someone at WoTC didn't think this class through very well. Still, if it's the official rule, then you're liable to p'off sorcerer afficionados by changing it - and there are are more important things to change like classes using spells they shouldn't, swapping out spell slots when you want etc.
On a related note: haste is really overpowered and simply broken in BG3 if it allows you to cast another spell that you would not normally be able to cast - the 5E rules are fairly clear on what you can use the extra 'action' for, and casting a spell isn't allowed. An extra attrack - fine...but even guzzling potion/using a scroll (activation) isn't allowed, if you look at various rules discussions. And haste potions are so easly to find - haste is a 3rd level spell, we should barely see these potions in this early part of the game, and they should be extremely valuable. I already have 3 and I've just reached the Druid grove...Maybe this is an EA thing, have so much ready acces sto usables...I hope so.
With regards to initiative: in D&D, intiative is always somewhat variable - but it's biased by your stats like everything else (combat rolls, checks etc). The point is to be adaptable in combat - deal with what the dice have dealt and be strategic. The only annoyance that does impede strategy is the lack of a delay action so you can move down the turn order to better synchronize abilities. But rather than screwing with spell balance they should fix that. Pathfinder wrath does this perfectly - I use it all the time in TB mode.
