The 4 times a season for me is a nonsense because it's not just league games, if you include Bet Fred groups, then possible replays later on in that competition, then possible replays in the Scottish Cup it could be easily double that. It's unlikely, of course, but not impossible.
Then there is the fact that 4 times a season, in general, helps the OF dominate. You might take the odd game or two off them, but it's unlikely you'll take all 4. Again, not impossible.
So, aside from the tedium, there is the possible repetitive nature and the benefit it gives the bigger clubs (esp the OF). As it's 11v1 and both OF clubs won't vote to make things easier for "lesser" competition, then add in the pressures of the broadcasters who really couldn't care less so long as they have enough OF derbies to fill their schedules, it will always be that way.
It's so annoying we have painted ourselves into a corner here.