I understand why they would tell you that, and yea it makes total sense. However, I believe you can still start with a large pot if you water carefully, just around the stem and not very often, allow it to dry out between waters. Lift the pot, feels heavy, wait. If it feels light, water. The advantage to this is you won't have to deal with any transplant stress.
When I set up my 2 liter nursery pots for my current grow, I watered the entire pot with a water/root simulator mix a few days before I even started germination. Put the pots in my tent and kept the lightson. After my seeds sprouted I put them in dead center, gave em about 1 table spoon of water, loosely cover with plastic wrap. Waited for the sprout, took off the wrap and let em ride until the soil dried enough for the first water. (over a week) Then it was about a week before the next watering was due, now as they grow the gap between watering is roughly 3 to 4 days.
Hope that clears up where I was coming from.