New Development Elevators

We live in a 2014 new development of 45 stories, about 250 apartments. There are 3 passenger elevators and 1 dedicated, larger service elevator. Been looking in a new non-traditional neighborhood at some newer construction, buildings high 30s, to mid 40s stories as well, fewer apartments (fewer on average floors, plus penthouse floors), and there are only 2 elevators. What is the developer thinking - -fewer people per apartment including fewer kids -more pied-à-terre / fewer people there at any given time -owners move less than renters / need service elevator less -fewer ordinary deliveries (eg food), delivery people ok using the passenger elevator -exchange of elevator space for more sellable square footage -exchange of elevator space for more amenities