I think the “eliminate properties instead of falling in love with them” mindset is huge. From the GIS/environmental side, I’d add wetlands, drainage/terrain, soils, surrounding land use, and how much of the parcel is actually usable for the intended purpose.
That last one gets overlooked a lot. Ten acres on paper doesn’t necessarily mean ten usable acres once you start layering in floodplain, wetlands, setbacks, steep ground, access, etc.
I’d much rather spend a little time screening those things up front than discover them after money has already gone into surveys, perc tests, or design work.