Not meant to be snarky. I think we see a lot of wishful thinking dressed up as there has to be a way to have your cake and eat it too (no, there doesn't). I think the wishful thinking is additionally fueled by advertising that is somewhere between overblown and dishonest.
Most of the black box makers are in the business of retaining steering wheel control functionality. For some cars this is all you care about (ex. 2015 forester). For others, like the renegade, the head unit is access to the car's configuration, or at least a significant part of it. When they market their stuff, they usually base it around that insufficient goal.
There are a couple of head units that claim compatibility. They might work, but they are of the type of product where you are lucky if all the menus have localization text for english. And at $500-800 I'd have trouble trying them. If you are the kind of person for whom dropping $1k to mess around with it it might work out for you. But you'll be the first to post the results if you do it anytime soon.
One "option" i left off is that with the parallel amp system, you can also add a parallel head unit, the question is where do you put it. If tunes are your priority number one, this is viable, just give up the arm rest storage. However, I would not want to go through the hassle of undoing it later for a lease, although it can be done pretty stealthily other than at the battery terminals.
I've installed a bunch of stereos myself. The days of old aren't current days. The manufacturers are REALLY trying to push the aftermarket out for a variety of reasons.
IMO the factory head unit is pretty decent if you don't have the beats bug. The amp is sufficient. The speakers have some issues, and it'd be nice if they didn't have a prefab EQ curve laid on it, but that's about it.
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