I'd like to see lenses with the opposite trade-off: slow (ie. diffraction limited) but excellent optical properties. They'd be ideal for outdoor and long exposu

I'd like to see lenses with the opposite trade-off: slow (ie. diffraction limited) but excellent optical properties. They'd be ideal for outdoor and long exposure deep focus shots, and it should be possible to make them smaller and lighter than normal lenses. But these lenses seem not to exist despite their potential utility. People focus on low f-number just because it's easy to measure, and assume everybody wants blurred backgrounds. Is there any source for high quality slow lenses?