You have to think about this from an engineers perspective: You have an update that you need to deliver to Studio about a feature that developers can use. And it needs an UI. Normally, it wouldn’t take too long, as you have a singular interface and framework to work with. But if we go down with your route, now, there are two interfaces and possibly even more frameworks that you have to work with. This delays the update and especially the bug reporting and fixing stage from being complete.
This is not feasable for a company like Roblox, where there are tons of developers and users working with their software, this isn’t going to happen.