There're 2 kind of seat: "required" and "free". The following topic relate the first one, nothing with second.
For now, required mark is simply a symbol to make guest know the min players that host wants. But sometimes host just use the default setting or lose patience, start game with fewer than seats marked. It should be forbidden, since the guest maybe pick the table by this term, to start freely means an unnecessary rejection or unwanted game mode. So please put a red bar when host doesn't respect this setting.
For now, required mark is simply a symbol to make guest know the min players that host wants. But sometimes host just use the default setting or lose patience, start game with fewer than seats marked. It should be forbidden, since the guest maybe pick the table by this term, to start freely means an unnecessary rejection or unwanted game mode. So please put a red bar when host doesn't respect this setting.