Temperature in my opinion is debatable, but temperature swings are not, meaning if you have seedling sprout in 88 degrees and thats the same every day after then you will see little to no stress, lets say your seeds sprout at 82 degrees, then you veg at 78, and lets say your temps during bloom are 88 to 90 degrees, you will have a stressed plant and it will affect final outcome. Just my 2 cents
Respect