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Yes you can upgrade a lot of Dells, but the maximums in their manuals are based on their supported maximums, so if you run in to problems, your Dell support probably won't be of much use.

I find people trying to compare to a Dell (especially to anything which isn't trying to be a competitor - the XPS) come off a bit naive. Once you start talking about the XPS, the price difference shrinks. In the UK the latest XPS 13 with an i7, 32GB and 1TB and the better screen is around £2,000. The M2 Macbook Air 13 with 24GB and 1TB and fast charger is £1,979. The 13 pro with same specs is £2,149.

Having owned an XPS before (with its flexing chassis, coil whine, overheating, cpu throttling, noisy hot fans, smelly plastic), you couldn't pay me to have one.