The Longsoon CPU is apparently comparable to a 2020 era Core i3, so for 99% of home or work use they sound like they have more than adequate performance. Doubly so if not running Windows 10.
My current work-supplied PC is a 2014 era HP Prodesk tower...
Quite. Work updated me this year to an M3 Macbook Air from a 2014-era Retina iMac, which was still chugging along, although it needed more RAM and bottlenecked on storage as it had one of the short-lived "Fusion Drives" (SSDs were still violently expensive).
The M3 is spankingly fast, but in everyday usage the most noticeable difference is the massive drop in power consumption.1 This is rather nice when one is WFH and paying for electricity.
But really, for normal desktop usage, anything from the last 5-10 years is "good enough". If you're a hyperscaler crunching big data or training "AI" models, then you'll suffer on older hardware (time and/or power efficiency/electricity cost), but for everyone else... eh? It's good enough.
1. A quick google suggests the iMac had something like an i5-4690, with a TDP in the 85W area, whereas the M3 (4x the CPUMark, and double the single-thread perf) makes do with just 20W flat-out (and much less most of the time on the Efficiency cores. Idle states are probably lower power than the i5s were as well). The new (Dell Ultrasharp) monitor is probably rather more power efficient than the old retina as well - display tech having moved along somewhat in the last decade.