Why All-For-One goes for a full frontal assault against All Might? It was very strange to see All-For-One (who make possess large number of different quirks) choosing a brute-force way (all kind of power-ups to increase strength).

It feel like there should be amazing (almost unbeatable) combinations of quirks. As an example - Invisibility + Warp + Compression + Multiple hands.

You come to some place (invisible), open multiple warp gates, use your multiple hands to touch and compress all your enemies at the same time.

Gave over.
Remember that in that fight, AFO (All For One) wanted to take away everything All Might had been trying to protect, one by one, starting with his pride. AFO wanted to destroy All Might's image as the Peace symbol, bring fear into the hearts of the people and lose their hopes in him to create a breach in the society.