So, All Might can get a mecha suit, copying all his students quirks, provided to him in under a year (really a couple weeks max). However, Izuku needs to wait eight years to get a prototype and work to provide more data.
Seriously, what's the process of Izuku's mecha suit? Not every villain is gonna be the "demon lord," he could've gotten something simpler way before his second year.
You bring up a good point anon!!
Assuming that all might put in the request for that mecha suit after he retired then it would only be 6 months or less at most for that suit to be created and made. Also, while it was stated that the suit wasn't steady it was very much strong enough to tank multiple of AFO's hits and it had the ability for 30+ quirks which is insanely strong and powerful.
Also can we talk about how insanely better all mights mecha suit looks compared to izuku's?!!!! Iam not sure why but honestly I love all mights suit it looks so much better and is overall much more better than Izuku's one that took eight years to make.
Like you said it's rare for villains as strong as AFO to come around so izuku didn't need an unstoppable suit and also it's a shame we don't see izuku being involved in the process of making the suit especially because we do get a tiny glimpse of him and Melissa interacting in the last chapter during Izuku's second or third year at ua.
Lastly, I want to bring up the fact that all mights suit was probably inspired from David's own discovery and his quirk amplification device which helped Melissa create the all might mech suit (she is so underrated for that) and then she worked with mei to create Izuku's suit but they should of technically gotten it at a much more earlier time unless it was the financial aspect they were worried about. However, that doesn't make sense because all might managed to buy and afford his suit by himself but Izuku's took all might and all of 1A? (How is Izuku's suit different to all might in anyway?)