Once Toshi retired and no longer had to pretend he's invincible, he began to warm up to the idea of using mobility aids. He mentioned it in passing to Midoriya and, with Bakugo's reluctant help, his protege latched on to the idea until they could make it a reality.
Aka. me giving All Might a mobility aid that has additional self defense features because its epic and he's epic and i need more dadmight that includes Bakugo
fun fact! before I started watching dan and phil.. i thought they were a band.. bc of their american tour poster i saw years ago. so. thats where this idea came from lol