I think the question to a large extent depends upon what you see as the goal of a season. Is the most important goal to ensure that the best team promotes? Is the most important goal to ensure that the playoffs are as exciting for everybody as possible? Is the most important goal to ensure that teams are not bored by a long offseason? Is the most important goal that every regular-season game is meaningful? Is the most important goal that teams who do well in the regular season get rewarded for their good play?
I think the most important goal is to ensure that teams are not bored by a long off-season. If you want people to continue playing, there has to be something to do. If they find that they can go a couple of weeks without logging in, they might go another few weeks, and then decide they can do without BB.
I think that you understood this, and this led you to compromise on the playoffs, with single game QF and SF, which reduces the chance of the best team promoting, and devalues the regular season.
I think that your mistake is to treat the playoffs as being goal oriented, toward choosing a single team to promote, and not look at it as an opportunity for a different format of competition. First, you are going to have to promote more than one team in 16. Otherwise you are going to have a horrible bot-buildup, and other teams are going to get frustrated at being stuck in a league and then losing a playoff game. Since you are going to have to promote more teams at least to replace bots, then I think the post-season should be more oriented towards ranking teams.
If you devote 3 weeks to this, you can have multiple 3-games series for the elite, using 3 dates per week, which will provide a more meaningful test, including team depth; while also having competition matches for other teams. There can be clear economic rewards for being among the elite. And the rankings for the other teams can be based on a combination of league and post-season play.
However, if we are getting both complaints that the playoffs are too long and complaints that the playoffs are too short, then we'll feel that the length is probably about right.
My complaint is that they are too variable.
0 games for 4 teams, 1 game for 4 teams, 2 games for 2 teams, 2-3 games for 2 teams, and 4-5 games for 2 teams. If you lay this out in order of place you have 4.5, 2, 1, 1, 0, 2.5, 2.5, 0
and because the reason they have so many teams make the playoffs
It is because they can make more money, and they haven't figured out a competition for the other teams.
I didn't propose anyhing like the NBA nor like a European-style soccer league. If anything it is more like the world championships in sports like hockey or basketball where teams continue to play for ranking even after league (group) play.