I'm sure dell does the same terrible handling of DGPU power and badly written ISRs that pointless raise system latency. I had shoddy crashes for months that would cause my dell laptop to BSOD and burn up in my backpack because the DGPU got stuck on I a loop during some ridiculous windows modern standby wakeup.
I also ran into weird Wi-Fi issues that required a reboot, and getting that thing to recognize external displays without corrupting video is some kind of dark art while my Lenovo and Steam Deck work just fine with the same USB C plug.
Apple beats some brands for sure (especially the cheap "consumer" lines with a starting price lower than Apple's headphones) but their computers are hardly flawless.
I have yet to run into issues with my Steam Deck, which is very impressive, but I'm sure I'll run into an issue at some point. No computer works flawlessly.
Steam Deck is just... extensively tested and debugged in ways that I don't think Apple did unless they got an egg on the face in national media (remember "you're holding it wrong?")
I use mine on a train that has Wi-Fi with a captive portal and attempting to join it makes the whole UI unresponsive. Using the overlay with a guide in a game always resets the scroll location. These are the kind of things I can live with, but also things I don't expect ever to be fixed unless Valve come out with some wholesale replacement for some overt new strategic goal.
Replacing the battery costs like $200-500 because the screen likes to explode when removing it.
Lenovo docks of a specific gen will have the USB hub/billboard just crash and stop doing display port.
older Dell docks would pollute arp tables and crash switches.
Computers have always had some wild flaws, some worse than others. They are built to a price point typically and by humans under politics so the best design or parts usually don't make it -- cost and profit.