CBS Sports vs Yahoo Plus Roto Lineups

[CubsRefugee]

I am setting my first CBS Sports standard roto lineup. I may be confused because my past experience is only with Yahoo Plus roto.

For CBS Sports standard roto: The maximum roster size is 24--22 active and 2 reserve or DL. It appears the only flexibility you have to set a legal lineup is to identify two reserve players to sit out. So you are always scoring 22 of your players, assuming a full roster.

For Yahoo Plus standard roto: The maximum roster (excluding a DL) was 21 including 5 Bench. So you are always scoring only 16 of your players, assuming a full roster.

If this is correct, CBS Sports' approach forces a lot more roster changes thru trades, drops, adds or running with a reduced roster size of just the best players. Are the leagues that different, or am I missing something?