WTF is with 0w-20 in modern cars??!

We were looking at newer Jeeps for mom, and I could help but notice the Wrangler had “0W-20” on the oil cap. Then, the Grand Wagoneer took 0w-40. This is wild shit. Even my little Kia takes 5w-20, and all the Jeeps I had took 10w-30 at least. My Harley take 20w-50.

Are the tolerances that tight now? Will these engines wear poorly or be less robust?