Yes, I totally agree with the implications you point out. That level of precision is not offered by the status quo level of granularity. At any level of granularity, there will be pros and cons. Please consider sharing your thoughts on https://slack.openstreetmap.us/ as many great discussions happen there. I'm imagining an OSM so granular that my living room automatically switches from landuse=residential to landuse=commercial during business hours when I am working from home there. To the opposite extreme, there was a recent user block for someone relentlessly was adding uselessly broad, large, inaccurate landuse areas in Connecticut and wouldn't respond to comments: https://www.openstreetmap.org/user_blocks/15714