On one hand, One For All is an immensely powerful Quirk, and in Deku's hands, One For All felt like plot armor.So, on many levels, All Might gave Deku an incredible gift as a mentor.

MHA: What Is All Might’s Iron Man Suit? My Hero Academia Chapter 396 reveals Armored All Might, where All might now has a power suit of his own as his vehicle Hercules acts as a support item.