This thread is getting beyond silly.
Dell has a lot of laptops. Most of them are upgradeable. The XPS line has for some time been moving more and more towards 'thin, light, powerful' and within that particular market, they all tend to be not upgradeable.
That doesn't mean that all Dell laptops can't be upgraded. Most of them can be. You just don't want this laptop, fine, move along and do a logical comparison of other models with competitors.
Oh and be ready to complain and whine when AMD and Intel release chips with integrated memory like the Apple M1/M2. That's coming, it's a logical next step. I give it 2 years max before we see something like that from AMD / Intel. The latency and bandwidth advantage is significant, they just need to get on sub 5nm nodes to make it really practical without exorbitant costs.