It's still possible even with DRM, it's just more work. You have to get out a debugger and write new code. But what I meant was that you shouldn't try to make

It's still possible even with DRM, it's just more work. You have to get out a debugger and write new code. But what I meant was that you shouldn't try to make modifications impossible. Yes, it's futile anyway, but it's a bad idea independent of that. If you've designed the system right then the users shouldn't need to modify it. So if they do it's a signal that you've missed something and then you can improve it. Whereas if you declare yourself the final authority and refuse to facilitate user modifications, or worse actively interfere with them, then any mistakes you make are silently uncorrectable.