I see different styles of boards for wave riding breaking waves, what are the thoughts on board size and shape for focus on wave riding? The wind can be a bit fluky in a break and you might want a bit of safety getting back but at the same time you want something that is nimble and turns.. So if you are say 80 kg, a narrow board but long (5.0') (Fone wing S) around 55l or a short (4'8) compact parallel rails board around 60l is one board better for waves than the other? a compact (swing weight) vs narrow board (turn harder)
In waves maybe - 20-30l is too small? maybe it's not much different to have a board volume same as your weight then a 20l less.. What do you wave heads think? Is the board size/shape really that important for wave riding..

A lot depends on the conditions and skills. Where I ride it is really useful to be able to slog thru the lulls and to get off the beach so a semi floater is nice, my next board will be 5'3" x 22 80l, so weight minus 13l for me at 93kg

It very much depends on conditions, skills and your sizing.I,m 188x95kg, and wing most of the time in a short period bumpy wavespot. getting going quick is key.I have an AK 5.6x90l as lighter wind allround board and my small board is an KT5.4x22x56l.The key with this board for me is its length wich makes it more stable to sit on and helps in getting going without sailing overpowered while still feeling small and nimble due the 22width and thin shape.
Before the KT I owned an 4.9x60l but that was simply too short to get on going for my weight and length.

I'd suggest going for good flotation and a v-tail board. The v-tails allow you to get up quickly (provided you have enough flotation) and you can crank those carves like a mofo without catching . I'm far from an expert wave rider but for me the v-tail was a total game changer while staying on short masts. I'd also add, super important to get forward tracks