Secondly, revenue is super not meaningless! It's the capacity for you to be profitable! Amazon had 0 net income but were able to spend money on growth because they had revenue, and were able to classify their R&D as an expense, which pushed their profit/net income down. Without that, they would've been a positive net income/profit company who then reinvested net income/profits into R&D.
You can do all the expense classification shenanigans you want to to muck around with profit (ex. have profit & spend that on growth, or classify your growth as an expense and have no profit), but it's a lot harder to grow without having the money to put to growth. You'll get that of course in two ways -- increasing capital (equity/liabilities), or well, revenue!
EDIT: Had some typos so cleaned them up.