Motor OS (https://motor-os.org https://motor-os.org) attempts to do exactly that, by focusing on a rather narrow, from a "mainstream OS", point of view, niche.

Motor OS (https://motor-os.org https://motor-os.org) attempts to do exactly that, by focusing on a rather narrow, from a "mainstream OS", point of view, niche. Kind of "do this one thing better" approach.