That's true, but they use nonstandard voltages on their chargers, and it can be tough to find an aftermarket that matches both the voltage and current of stock. Then you run into the "Dell has detected a non-Dell charger" scenario.
Dell is really crappy about third party chargers. When you get one of their laptops, you are stuck in their ecosystem. They used to do this with memory as well.. then they didn't... then they did again. Don't know which phase they're on right now, but I'd dig on eBay or Craigslist for an exact replacement.
I used to work next to small commercial bakery, and they would give us stuff from time to time if it was near the sell-by date and they hadn't scheduled a shipment.
One day they gave us some of those tiny vending packs of muffins, the ones with two little colorful things in plastic. They were awful. So bad we bet that even the ants wouldn't touch them if we left it out.
It's been three years now and that muffin is still there, identical to the day we set it down (not counting the dust).
They stopped being good cars in 2004. Twenty years they've been shit, and people are still swallowing the gravy.