I'm not really about performance and/or training for any goal either.
I am a roadie, with hard packed gravel on occasion.
What I am about is riding my miles efficiently, as I get older. Still comfortable (truly) in the drops.
The weight of a Schwalbe 30mm, all-road tubular over a supple Veloflex 25 changes the bike's feel. Dramatically. Especially the hill climbing home, on nearly every ride.
I gave in to 32s - for a road tandem.
edit: But I am planning on 650b and lightweight 42mm that I think may fit.
No sense being a curmudgeon, without having the personal experience to know 1st hand.