what are the top 2 things you'd want call of duty to bring back from older games like black ops?

nothing quite compares to this aesthetic in a call of duty title, something that has been completely lost in the franchise..
but the gameplay just never got boring, it's like with every fps it makes sense to think repetitively pointing and shooting would get a bit boring but not here.
same with a couple similar fps games from the same era. miss it so much