It's great to see so many folks who have been well served by their Jeeps! But, individual experiences with a particular vehicle aren't relevant to other buyers really - they are only relevant to the buyer who had the good experience, and maybe a trusted friend or two. I'm not surprised Stellantis is struggling - they don't represent good value compared to the competition. Let's take a look at the 4x4 market specifically, because it doesn't matter if everyone here has had great experiences with their jeeps - the aggregate tells the story, and folks see that story and go buy a Toyota instead. And the aggregate is controlled for units sold, so the idea that "of course there's Jeeps with problems, they sell so many" doesn't really hold up.
I'm not being mean to Jeep - I LOVE Jeeps. I've owned two and put about 400,000km on them. They were definitely not without problems but I loved them anyway, and mine always got me home. But I would not recommend them for reliability reasons just because I always got home - I'd recommend them for a whole host of other reasons, but reliability is not one of them. Bad bearings, cheap sensors, etc. are all pretty common problems - all fixable with better-than-OEM upgrades, but that begs the question why not put these better products in to begin with?
The answer is money - folks can argue that "If Stellantis used a higher spec bearings/sensors/etc. in every JL, they'd have to increase the price", but what I've seen is that the price has increased anyway - they cost as much as a Toyota - but without the commensurate increase in quality, and that's going to put people off. A base 4-runner starts at $57k CDN. A 4-door base Jeep is $52k after over $2k in baked-in discounts.
That extra $5k puts the buyer a lot further ahead in aggregate reliability:
Consumer Reports
JD Power
If I'm shopping for a new 4x4, the above tells me that buying a jeep is a bad decision, and buying a Toyota is a good decision.
All that being said, I actually AM in the market for a new 4x4, and I won't be buying a Toyota - because, to a large degree, buying a vehicle like this isn't a good or bad decision, it's an emotional one. You gotta get one that gives you smiles for miles - and I'm sure many here would agree - those smiles can make us turn a bit of a blind eye to things like aggregate reliability ratings. But, we are an enthusiasts community, so we're apt to do that - the average consumer not so much.
If Stellantis were selling their vehicles for a lot less than Toyota, they'd have way higher sales. Hard to say what that would mean for their fortunes as a company as I don't have line-of-sight on the margins, but I don't believe they are priced at a "cost plus X%" - strikes me they are sold at what Stellantis thinks the market will bear, and they have really misread the market.