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You can get an adapter that takes an M.2 SSD and plugs into the X4 connector of the PCIe bus. But that is already occupied by another Samsung M.2 that is her data drive. So no, I have no use for the unit supplied by Dell.
I don't buy off-the-shelf PCs. I always build them with myself with parts I select.
My kid and I just built him a (gaming) PC, he selected the video card first and then we selected everything else to go around it.
Previously, he had an off-the-shelf PC (against my recommendation of course) which didn't suit his a needs, but his mother buys him whatever he asks for. The only parts re-used from that are the CPU and an HDD. The old M.2 SSD was replaced with a WD Black one twice the capacity.
Now he's watching CES footage and drooling over the upcoming graphics cards.
One of advantages of building your own is the ability to upgrade.
I just upgraded mine to 32G memory 1T SSD in preparation to go from Win7 to Win10.
Plus you don't have to clean all the crapware from it.
Did a little mechanic work today.
Put a rear end in a recliner!
I have bought numerous Dell units over the years and on the whole found them quite reliable. However, they do come with a bunch of crapware installed, so the first thing I do, is to run the Diskpart "clean" command on the system drive and then do a clean install of Windows.
I won't disagree with that, but in my experience, I've yet to encounter a case where an OEM system turned out to be cheaper than buying all the parts separately.
But then again, it's rather rare an OEM - especially a brand name like Dell - has a PC to sell that only contains parts you can purchase elsewhere. They all tend to have some proprietary hardware with no equivalent that will skew the prices.
OTOH, if you're buying in large enough quantities, yeah, it'll be cheaper in the long run if you get something pre-built than if you have to take the time to put a bunch of PCs together yourself.
The other thing...personally I despise not being to open a case just because I'm assumed to be so incompetent replacing a hard drive will void the warranty.
Same parts, from the same manufacturers? Where do you live, where consumers are gouged so badly?
The only (non-laptop) system I've ever bought pre-built was a cheap Acer Aspire something or other. But cheap is the key word here. For one, it came with a Seagate drive, which I would never buy on its own, despite Seagate typically being consistently somewhat cheaper than other brands.