Dell and Lenovo may limit mid-range laptops to 8GB DDR5 RAM in response to rising memory prices
(www.notebookcheck.net)
https://obsolescence.wixsite.com/obsolescence/cpm-internals
CP/M requires a minimum of 20K RAM, although realistically, 48K is the bare minimum. Most systems have the maximum 64K.
Sounds like it can't address > 2¹⁶ bytes.