We could order components just to try them out, without worrying that we were spending money on what may potentially turn out to be an unusable or unnecessary part. We could answer a lot of questions about what was possible using test setups rather than assumptions based on scraps of information collected from various sources.
80k probably would not have provided both R&D funds and some runway.
EDIT: I mean 'runway' in the sense of money for salaries, excluding R&D and other costs which could possibly be seen as ongoing costs of operation too.
"Notably missing from the investor group: Ron Conway’s SV Angel. Y Combinator founder Paul Graham said in an interview that this new format didn’t make sense for Conway and David Lee’s fund size."