Oh man, the good old hit cap debate!
Our tool calculates single target boss damage only, as that is generally the most important to gear for and the gear sets work fine for the trash too.
There is nothing magical about hit compared to other stats like spell power. Our calculations take into account everything and calculate the best result. Being a couple % shy of the hit cap is no big deal. If you cast 100 shadow bolts in a fight and miss 1% of the time… that’s one shadow bolt. Giving up a big chunk of stats to not miss that one time does not always make sense. We do the math so you can know what gear gives the best result.
All that being said… we’re arguing about tiny, tiny differences in overall DPS. If you don’t want to think about it - just equip the gear BiB recommends and you’ll be good. If someone wants to give you trouble about it, tell them to come here and argue their point and leave you out of it 