This is why:
https://imgs.xkcd.com/comics/standards.png
In reality, every OEM wants you to buy an adapter from THEM and not a universal one because …
https://gifdb.com/images/high/i-like-money-mr-krabs-squidward-kp224qvzk78vti45.webp
Money, it’s hard to beat a barrel jack when it comes to economies of scale
I have to admit I’m pretty ignorant in low-end laptops.
Business class laptops tend to be able to charge at 100W over USB-C, but often have a dedicated charging port as well (Magsafe for Apple, rectangular charge port for Lenovo, for example).
For any laptop that draws 100W or less, I believe they’re required to charge over USB-C in the EU. Barrel jack is cheaper though, so they can shave a couple of dollars off the price by using it, which could lead to significant profits in increased sales, since most of the competition is using the same basic parts.
Most new laptops do, aren’t they? I see new laptops having thunderbolt type C or USB4 for a charging/dock port. Havent seen a single proprietary in a while.
As for PCs, USB4 supports only 240W at max and therefore can not feed a modern decent GPU like 5070ti alone. Finding 240W PD charger is also a major task.
