Maybe they’re checking if people automatically go for the most expensive laptop on the list?

Seriously though, it’s the only one with 16 GB RAM and 1 TB storage, it’s a no brainer, unless there’s an option to upgrade any of the other packages up to $1,499? You can get a configure-to-order (CTO) option for less than $1,499 on other laptops and have a more capable laptop (except for the lack of a discrete GPU).

Do a memtest. Wonky memory can cause problems like random blue screens.

You can still buy old stock factory new DDR2 memory with warranty, and I think new DDR3 modules are occasionally being made.

I wouldn’t worry about future availability of parts, DDR4 is going to be around for long time.