I've examined the reasons for the rule requiring a minimum of two players for league and playoff matches, and whether it's reasonable.
The first possible reason is that Clubs Mode is defined as a team play mode.
Solo play violates this definition and should therefore not be allowed.
However, what we truly consider team play is a team of at least five players. Of course, everyone has different perspectives, but no one would consider a team of two to be team play.
If so, we should increase the player limit from 2 to 5. However, increasing the player limit would worsen accessibility, resulting in a poorer pool and fewer matchmaking teams. For these reasons, we have no choice but to relax the player limit regulation. But why was the minimum player requirement set at two? Why not one? The reason seems to be related to the following second and third points.
let's examine the second possible reason.
This rule may have been designed with cannibalization.
However, as previously discussed in 14 section, there are clear differences between Ultimate Mode, Club Mode, and Career Mode, so I don't think that's likely.
Let's consider the third potential reason: the rule that only teams of at least two players can participate in league and playoff matches encourages team play.
First, as before, we'll define "team play" as a game played with at least five players. "Non-team play" is defined as four or fewer players. (This is because no one considers two-player teams to be the team play that Club Mode aims for.)
We've also broadly categorized Club Mode players into three groups:
G1 - Team play only
G2 - Both team play and non-team play
G3 - A group that engages in Team Play only when satisfactory rewards are provided.
Regardless of the rule, G1 will only play team play, and G3 will only play non-team play. Therefore, the rule doesn't encourage team play in either group.