In a way we do ask for forgiveness with our confession of guilt every time we are convicted in our hearts when we sin- which should be everytime we sin if we have a repentive heart. I think we need to ask for forgiveness to keep our attitude and effort in check. We should pray for forgiveness for both specific sins and for sins we commit in general. However, I do not think that if we missed one that it won’t be forgiven. As long as we have Christ’s blood all is forgiven.
But I think the danger is not asking for forgiveness at all, or not having a repentive attitude. Because if we don’t confess our sins He won’t be just to forgive us. Because without confessing, repenting, and a plea for forgiveness, we would then be sinning willfully and loose Christ’s blood- and therefore our salvation.
So my answer is yes but not to the extreme as if doing it for each sin earns forgiveness for each sin. But there is danger in not being in a constant sense of sin-rehab. We must work on dying to sin everyday- there must be effort to stop doing it. A Christian’s goal is to rid sins from thier life. He forgives our mishaps, but not if we take advantage of His grace.
”But if you sin willfully there no longer remains a sacrifice for your sins.”