A *%##@ opinion from a plant guy
First off, your watering regime for (as yet) ungerminated seed differs from an established lawn. For optimal germination, you want constantly moist, but not wet soil. Don't drench it, but water a couple of times a day until you get pretty good establishment. Then, slowly cut back to about an inch of water a week.
From a maintenance standpoint, your previous approach is about the best. Except in extraordinary circumstances, don't water. I'll go one step further and say that unless you have really poor (very sandy) soil, I'd rarely fertilize (if ever). Plants are a lot like most people...really lazy. If you are constantly watering and fertilizing (surface application), the grass will produce most of its roots at the very surface of the soil. Thus, when a drought hits or if you forget to water for a couple of days, bamm! The grass burns up. Forget to fertilize constantly? Yellow sickly grass. If on the other hand you wean your newly established lawn off of the tender loving care, it will actually grow a good healthy root system---down into the subsoil where it can mine water and nutrients on its own.
Want a weed free lawn, don't scalp it! If you let turf grass stay at a height of 2+inches, it will choke out weeds on its own. I let my lawn grow to 3", cut to 2" and have never had a problem regardless of the region (Chicago, Missouri, and now Alabama).
One last point, especially important for newly established lawns, but useful even later. Keep your mower blades sharp. Look at the newly cut grass. If the top is cleanly cut you're good to go. If, however, the edge is ragged and looks like it's been ripped off rather than cut, sharpen the blade. A dull blade on newly germinated grass is just as likely to rip the new plants out of the soil as to cut them.
Just my 2 cents,
Ed