I actually wish there was more single guitar, single voice recordings!
Something I really want to hear is a Martin Simpson album that is just him and a guitar, recorded live in a great sounding room with a great engineer - no extra backing vocals, no extra guitar parts, no concertinas - just voice and guitar.
I recorded my last EP like this - live in the studio, no overdubs, no edits, one guitar and one voice played at the same time. I'm not saying it's the best way to do things but I feel that I'm a solo singer/songwriter, and that's what my recordings should reflect.
You can hear it here:
https://open.spotify.com/album/4f8sI...SAqLdMDTRnB2oQ
For my next recording I might add a track of DI'd guitar that I could run through a little amp and maybe a delay pedal in a few places - this is something I do live occasionally to 'spice' up the sound a bit - but it will still be a solo live recording.
If you want to hear a modern folk album that is recorded like this and is really good, then Jack Rutter's album from last year 'Hills' is great:
https://open.spotify.com/album/4FHQP...R7eP0xXdJdiDPA