A 2015 Dell XPS 13 9343 is still running fine today. I replaced the battery twice, DIY-sourced on AliExpress. Stellar machine for the price (< 1000€ at the time)
The sleep issue is in firmware, was introduced in 2017, and any time the ability to use the correct sleep mode is introduced in firmware, it's quietly removed. The 2015 XPS is a great laptop, the 2017 and forward have significant, ongoing power management issues.
