Each sailor has to decide what they want to do at the lake on the light wind days, sit and watch (short board guys); plane and slog; (wide board and big sail guys); or cruse (long board guys). Regardless of the board, one can practice light wind freestyle to hone skilsl and balance. The other option is to stay home and play golf.
Of course this is over simplified, but we each have to evaluate what we want from windsurfing. There is no correct answer, and for those new at the game, they may not know what they want to do. I have been windsurfing for 29 years and have always had a longboard or two. However, with a formula board and an 11.0, I have chosen to only use the longboards for racing for the last 10 or so years. Cruising in 5-8 knots on a longboard simply isn't fun enough to justify a trip to the lake. That's me, but it will be different for others.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.