My other option is to move over to Linux (probably Debian), but I’m not confident I’ll be able to find something compelling for a reasonable price with great performance and battery life (mostly because RAM and storage shortage)
Nothing comes close to the battery life, performance, and formfactor of the MBA. A ThinkPad X1 Carbon might get close, but Linux always struggles with brand new devices. It looks like a base model starts at $1700 (USD) and it's going to perform worse and get worse battery life. It does have twice the RAM and storage at least.
That said liquid glass on Mac is much less obnoxious than on a phone. UI elements take up far less of the screen and it's mostly just actual content. Also it's a lot less glassy than than on iOS, even without it being set to tinted glass. Also future versions of Mac OS could fix it.