It gives you so much space on the ball which although creates a slower tempo game to 4s it also means individual skill becomes a lot more important. It's like a game of 3s because of the space, but a game of 4s with the need for tactics.
It also allows for more variation on formation. Rather than the standard GK, DM, AM, ST formula for 4s, it means you can play GK, 2xDMs, AM, ST, or GK, DM, 2xAMs, ST, or GK, DM, AM 2xSTs. You can get rid of AMs and DMs altogether and just have GK, 3xMids, ST. Makes it much more interesting than simply an attacking mentally vs a defensive mentality as in 4s.
Say yes to 5s