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This is actually took me a while to piece together but Izuku losing OFA wasn’t for his development it was for Katsuki’s. I just don’t see anyone talk about it, and Ik for some that might sound far fetched but like,,,,Izuku didn’t need to lose his quirk, it wasn’t necessary at all for him, and didn’t do much for him development wise. Izuku has always been selfless, and was born quirkless, if given the option to keep OFA or save Shigaraki, he’d do it again. The most important outcome of that sacrifice was the Katsuki crying scene. It was necessary for Katsuki’s development because that’s when he realized what was truly important to him, it was a loss of something he took for granted—Izuku being by his side. Izuku was always a constant in his life, It was something that he sorta accepted at natural, as inevitable, as ‘that it is how the world is and how it will always be’. He spent his younger years unsuccessfully pushing away Izuku and then eventually realizing his mistakes, then apologizing and working to fix their relationship. So Izuku losing his quirk, that future, that constant of always being by his side, was absolutely devastating to Katsuki. Which in turn had him work towards this goal of making sure Izuku got his dream in the end(since I personally 100% believe Katsuki was the one to bring up the suit idea, alongside All Might ofc), just because he could not stand the idea of Izuku not being there with him for the rest of his life.

This also ties into Katsuki’s redemption and the consequences of his actions, since I see a lot of people say that Katsuki didn’t face any real consequences after bullying Izuku, which he absolutely did!! And this was one of them. Katsuki is very much reserved in his emotions, and has a very particular way he goes about expressing them. So for this revelation to be so great that it immediately sends him into tears is a showing of his incredible devastation. Katsuki did suffer for what he did to Izuku in the past. But I guess most people assume that “consequences for your actions” is a stern talking to and a slap on the wrist from an authority figure, when in fact it’s much more complicated than that.

All in all this is just my interpretation of it,,!!