It's simply a case of what plays are available in a no-limit game. With a max buy-in of 40BBs, there will often not be enough behind on the flop for someone to bet enough to deny pot odds to draws, for example. The shorter the buy-in is, the more it simplifies the game. If you want a game that rewards skill more and luck less, you'll go to a deeper buy-in.
There's a chart
in this thread that illustrates how many more plays are available with deeper stacks.
This is especially true in very small games, as the average pre-flop raise tends to be very large in terms of BBs. What is the standard open in your game?
Last edited by Garick; 08-24-2019 at 10:00 AM.