The GPU requirements of a terminal are _minuscule_ even under heavy load. We're not building AAA games here, we're building a thing that draws a text grid. There is no integrated GPU on the planet that wouldn't be able to keep a terminal going at an associated monitor's refresh rate.
From a technical standpoint, there is zero downside whatsoever to always using the integrated GPU (the stance Ghostty takes) and plenty of upside.
Cherry on top is me being a former user of a MBP 2010 who'd crash when using discrete GPU (it was _the_ reason Apple went with AMD later on). And some apps insisted on using it, even when I disabled it.
I like Rust applications but I don't like this response. The dev sounds worn out; whereas the dev of Ghostty seems to be a pleasure to deal with.
I just find myself on the other side of the line for Alacritty.