You are of course free to do whatever you like, but I would like to mention the two dangers I see with that approach:

1. If no-one uses the free version until it's necessary, it might decline and die, and then won't be around to save you. I'd say this is the Firefox / Chrome dynamic currently.

2. If you don't have the freesom to do something, you might not know what you're missing. Re: your comment in another branch, I have done all of "moving stuff around a file browser, installing ad-hoc apps, opening a command line, etc" on my phone in the past 24 hours, and had a great time doing it.

There is an increasing trend of younger generations using phones for tasks that we'd use computers for. I've even heard of cases where students write short essays using Google Docs and their phone rather than pulling out their laptops (although I can't verify these stories). Some social apps (like Hive, an attempted Twitter replacement) don't even have desktop/web versions and require using the mobile app to interact.

While you don't use your phone like a PC, I think there's a strong case to be made for allowing for that kind of functionality. However, like you said - you don't need to switch if you don't need that capability. I personally install a lot of apps from FDroid or straight from APK files, but I don't use my phone like a PC like I just described. The range varies, and having that flexibility is nice.