>> 7.0-7.3: min. body weight 70kgAs a general rule rather use a slightly too small than a too big sail.
Well, that doesn't sound right at all...
I'm close to 62kg at times and should then not use anything larger than a 6.0-6.3, independent on what board it is on. (!)
For me the break point is at around 11.0 sails, but above that is also fine once fully planning.
Slightly too small vs too big seems like a challenge on a fin too. Even not racing why wouldn't you just deal with the gusts and stay planing vs slogging around in the lulls? I think it's just optimistic marketing speak tbh