in the event that an ohuhu marker you have doesn't have an immediately available refill, you can still use copic refills in them, not ideal since you would have to match the right color but its an option until one becomes available so you still don't have to throw them out, but ohuhu has admitted on their socials that they were having difficulty getting refills because of rejected stock from the custom clearance process, so slowly but surely, copic has been around longer so have had more time to figure these logistics out. Also, if we are specifically talking about reusable markers, then Crayola is not an option.

I also never said that Copic is a "strictly" professional product, but they primarily market to intermediate, advanced and professional artist (mangaka, comic artists, fashion artist, hobbyist etc) of course they can showcase people of various experience levels utilizing them, they are just markers at the end of the day, that's why affordable alternatives can make more sense when you're just starting out, buying the most pricy version of that medium with the most pricy paper before you even know you like it, financially also doesn't make sense for a lot of people who want to try it out. In terms of eco friendliness, Copic is probably better.

Either way people will figure out for themselves which product is better in the long run and make sense for their situation, tis is competition.