I have oddly strong ankles, feet, and legs because my main activity, rock climbing, requires it at the level I'm at. You're often pulling on a dime sized sliver of rock with a single leg to do a hard movement and you build foot strength over time. I've done PT for various issues, I'm only 175 at 6 foot 3, and am strong in any barbell lower body movement (2x bodyweight deadlift off the couch never training it).
That all has fuck all to do with insoles. Skating is a ton of jumping and landing/eccentric in weird asymmetrical positions. Having some arch support helps keep my ankles and knees supported during that. If you're skating a few hours and battling a trick you're popping and landing dozens of times in a strange position vs lifting in a fixed stance or running in a straight, repetitive line. For me it's made a big difference over weeks and months in terms of having zero joint issues, no foot, ankle, or knee soreness post session, and just general comfort.
Skate brand insoles are trash and most excessive padding is a bandaid. Most amateurs aren't even skating shit with the impact an aging Reynolds has.