[iwiririwo]

While I think most of the "series" itself make sense, the configurations are often insane.

The X280 still has a 1366x768 display option.

For T480s, you need to figure out if you have 8GB RAM or 4GB soldered + 4GB. Even more stupid, the latter option comes more expensive.

[snaky]

There are 8GB soldered, 8GB soldered + 8GB DIMM, and other options http://psref.lenovo.com/Product/ThinkPad/ThinkPad_T480s

[iwiririwo]

so that 8GB option I considered to buy doesn't even have upgradeable RAM? Thank you for that page, it's incredibly helpful, also since I'm in a region without English website.

The configuration page lists the options like that:

8GB (4GB soldered + 4GB)

8GB

For me that implies the 8GB are configurable. What the fuck.