base::SysInfo::IsLowEndDevice is (almost) guaranteed to always return false on desktop platforms because its implementation is effectively:

if (ram_size_mb <= kLowMemoryDeviceThresholdMB) return true;
else return false;

and kLowMemoryDeviceThresholdMB is set to 512MB regardless of the platform (https://cs.chromium.org/chromium/src/base/sys_info.cc?l=25&rcl=fdda9f64969342df4a958995b7f360e18e74c23c)

The problem is that this function is used to determine how much memory should be freed when we detect that the system is running low on memory (e.g. entering the moderate memory pressure state). E.g. the discardable shared memory manager will try to limit the amount of memory it uses to 256MB if we enter the moderate memory pressure state, which is a lot on low-end machines (e.g. a Win10 laptop with 2GB of RAM).

This value should probably be increased, but this might be risky as some of the buffer sizes used on low end devices might not all be appropriate for a desktop environment (i.e. they have never really been tested on desktop).