Oh, I'm not trying to talk you into anything. I'm only pointing out that you can configure things. You don't have to learn new things unless they work totally differently. A lot of what a DE does is happening behind the scenes and making things more harmonious by applying similar settings to different applications. If that's not relevant to you, why indeed should you spend the resources?
A lot of key combos are just weird in that you have to learn them, like anything with an fkey. But the least weird of those are the commonest simply by definition. But then there are the downright logical ones like alt-tab. Tab is where it is because it's good for tabbing. Alt is convenient to press. Where there's an alternate switcher I map it to Super-tab, but otherwise, why would I want to use anything else? It's not about learning it, it's about convenience. Also, if I have to use some other system for some reason, I'm not reflexively pressing some combo that doesn't do anything.