https://www.cnet.com/news/apple-2015-macbook-pro-gone-from-apple-store/

With today's arrival of updated 13-inch and 15-inch MacBook Pro models, Apple took the opportunity to strike an old favorite from its store: the 2015 15-inch MacBook Pro.

The 2015 model remained popular with many Mac users despite newer, faster MacBook Pros because it predates Apple's switch to a new controversial butterfly keyboard design, the addition of a potentially frustrating Touch Bar and a move to USB-C ports and a dependency on dongles over a host of legacy ports.