It is a large pain when you have a 110 seat aircraft and when you check demand on a route and its ~70 pax so you schedule a route and then get an over supply warning 3 hours later because demand has changed to ~53 so then you have to edit each route individually. I understand demand is a variable number but it is a huge time suck to edit each route individually, being able to edit all flights from origin to destination would save a lot of time... especially when you getting a route oversupply warning, changing each route individually and then a few days later that same route has 100% load factor so you end up changing them AGAIN.
if you are only flying a single day during the week then you have not made a correct 7 day schedule
And I think what he means is if you fly only 1 flight a day (but each day of the week) from x to z there should be some sort of exemption from the oversupply warning. For instance if you fly a 737 and want to get max utilization you try to fill out your schedule with shorter/lower demand routes. Your 126 seat 737 will get an over supply warning on a route with ~60 pax demand especially since demand seems to fluctuate around 20%. In the above situation, especially if your the only one servicing the route, I dont see why it matters if you want to fly the route with a 100 seat aircraft or a 400 seat aircraft, your the one paying the bills.