But wasteful use of CPU cycles and memory directly manifest themselves in ways that are tangible to average users.
Yeah, but Zwift is graphics-intensive and it is clear that it has to use more energy for that.
Except it is not a niche of a niche of a niche since it applies not just to the Mac version but all versions of TR. If you use your old smartphone as a TR device, then it’ll likely have a weaker CPU and a weaker battery, which results in worse battery life. Battery life is not a niche issue, it is something non-nerds pick up on.