I've always thought of it this was as every boat builder can show the same analogy:
max=chevy HD work truck. does it all with the basics and can add some upfitting. same hardware as other chevys just missing some of the fluff.
makai/kaiyen=chevy silverado. does it all with more creature comforts and options.
SA/SL=gmc denali. does it all with every bell/whistle that skiers choice makes. some hardware shared with the chevy bros but some unique.
if you add all the gear to the HD truck, you now have a silverado. allows some on a tighter budget to skimp and for some others, they may not want some of the tech/fit-finish stuff.
just my take but I do recall when moomba rolled out the max, it was initially advertised as a surf boat first and foremost without some of the fluff.
'06 Supra Launch 20SSV-gone but never forgotten