This was my experience with a previous gen version that I was given at work too; half the hardware was different, it was hit or miss whether Linux would work with the wifi hardware you got (if they make a developer edition of the 15" though I assume that one would always come with a working chipset), it was falling apart much quicker than people with the 13" versions were, the keyboard was terrible (although the keyboard on the 13" was terrible too, but it didn't stick as much as the 15" did, though that could just be bad luck), etc.

I already have the XPS15 and have nothing but good things to say about it. I have had zero issues with it and love it.

What issues do you have? I do not notice a difference from the xps13 quality.

Random blue screens.

Poor USB-C support (sometimes ethernet died, sometimes screens changed resolutions...). The problem kept changing from BIOS update to BIOS update.

Then the USB-C harware failed: I could use it only if my laptop stayed perfectly still.

Only a few hours of battery life.

Drunk touchpad.

Speakers died after 3 month.

The 2 first points were fixed after years of hit and miss BIOS updates. It felt like beta testing the product.

Tons of complains from many users on Dell forum, with zero help from Dell.

Given the price of the machine, it's a damn shame.

That is rather unfortunate. I have had zero of these problems you describe with my XPS15 laptop and I have had it around 5-6 months now. I hope it will stay that way.