I understand it, but I find for us, the numbers never really favor trading in (the exception was at some points during COVID). We also use our vehicles for whatever comes up on the hobby farm, and keeping a DD near blemish free for a good trade value isn't a hobby for me...This scenario about flipping your existing vehicle for a new one is hard for some to understand on here.
TBH I do like the simplicity and directness of the analogue Focus, and not worrying about paint or whatever, its a tool like my tractor or mountain bike, dish washer, etc, not a showpiece of automotive art. I don't worry about warming it up, or cooling it off, or putting snow covered skis in the back... I'll leave the hatch open to make sure it doesn't get moldy back there, but if skis scratch some plastic trim that's OK! I like even autocrossing it, which I wouldn't do in a car of significant value at our main location(walls nearby). I guess its thinking of your car like work boots or trail running shoes, you use them until they are done.
I am a bit worried as these simple cars are disappearing as more people get into complex cars and trade in before their out of warranty though. The next one after the Focus may have to go quite a while!