So what you mean to tell me is a whole glacial comp isn’t going to interrupt your karthus, aurelion, or katarina?
Glacial ranger needs to land 1, maybe 2 autos to stun lock you. And it’s funny that you pretend glacial doesn’t get items. Not to mention glacial ranger is easy to get.
I’m saying this as a guy who consistently goes sorc and wins, glacial is far easier to accomplish and is far more flexible.
I don’t understand where or what your burst concept is of. If it’s damage, then glacial has plenty of it, though maybe not as much as sorc or blademaster.
For a team to burst a glacial team, firstly they need to charge up enough mana to use their ultimates while there are 6 champions on the enemy team that have a 45% chance to stun on *every auto attack,” while having aoe stuns and lots of lockdown ultimates. All it takes to shut down sorc even harder is a dragon fang/hush or a couple demons. All it takes to shut down blademaster is sword breaker (especially on volibear who cna proc it on multiple targets.) A morellonomican/red buff (latter for volibear) on a champion with aoe ultimates will negate much of the noble bonus. Swordbreaker and phantom dancer will also shut down assassin comps hard. Thornmail helps as well. What item do you build to deal with glacial? What strategy can you take?
And this nonsense about “dream comps” lol. 7-8 champions is the natural late game. Having 3+ synergies at 8 champions with one being a full 6 unit synergy is pretty damn strong. If you’re stuck at 6 units you’re doing something wrong.
And I don’t know why you think a 6 sorc comp, a comp with multiple highly contested units: aurelion sol, lulu, morgana, kassadin, is easier to get than a comp where nobody really contests anything. The only champs I have seen people interested in taking where sejuani and ashe, and usually both were because they are the one guy going glacial in the first place. Oh yeah, the karthus on the sorc team is gonna carry so hard, as long as no one sneezes for 5 seconds he can get off one ult that’ll hit 4 targets, or maybe 7 if you manage to get a level 2 that early as you claim, considering it isn’t even possible for him to appear in rolls before level 6.
Oh yes, I forgot, what was sorc comp’s 2 unit and 4 unit bonuses again? Are they comparable to to 25% on hit to freeze and 35% on hit to freeze? Oh wait, I forgot, their buff is 35 AP to everyone... at 3 units. Now your champions deal 35% more damage on their ult if they get to that is! Anyone can start a glacial comp with 2 champions, meaning it’s easy to pivot into or out of glacial if one wants or needs to! And 4 glacials is plenty if you’re feeling like going for a different partial synergy as well.
TL;DR: A) glacial is easy to build into B) glacial requires no commitment and is easy to pivot into and pivot out of. C) glacial teams still build items so it’s not like your fully equipped teams are going to be facing itemless glacial teams. D) end game 7-8 champion teams are the norm, and glacial gets several very strong side synergies if it wants, which usually require only 1 champion. E) the cc with such a team is so huge that there’s no reason why you can’t just add on a no synergy damage dealer as 7th or 8th champ, or perhaps as early as 5th champ considering 4 glacials is when it starts to get consistent. F) Glacial has a tanky team composition while also having high cc, they can stall for a long time. After you somehow manage to hit them enough to get mana, you still won’t be able to burst anything except maybe an ashe or anivia, if your team is smart enough to target them/the glacial dude is dumb enough to misposition them. G) Glacial stalls long enough to make items, effects, and champions that need time to stack take effect, like guinsoo’s (which makes you permastun harder) and gnar (massive extra damage and massive chain cc).