[NathanielK]

Since the only thing consumers use full size PCIe slots for now is for a single GPU, extra M.2 slots isn't that big of an ask. One M.2 keyed for an interchangeable wifi card, one for NVMe storage, and then an extra one if you want to upgrade to more storage later. If you only have one keyed for storage, you're SoL when you buy a bigger one later and it's very inconvenient to move data over.

[wtallis]

PC motherboard marketing and reviews usually don't count the WiFi card slot when tallying up the number of M.2 slots (since approximately zero motherboards are sold with an empty WiFi-type M.2 slot), so the complaint was most likely about not having more than two storage-type M.2 slots.

[Dylan16807]

It's not a big ask, but it's also quite unimportant. Adapter cards to put one M.2 card into a PCIe slot are in the $5 range, and better adapters will do four.