understand why you identify this 投釣版 on 灘投 (or my understand is 無限制式遠投 in anywhere not only on the beach) but I just feel that if that the case the topic we can discuss will not a lot. It is because 灘投 is only part of 投釣 and I will consider as a simple one.
Just give you an example. why there is different浮波in 磯 釣 and people will discuss what time will use which one. Same in 投釣 the 中通鉛 also have different number and you can ask people how many of them are really understand the 中通鉛 they used?
If you limited the 投釣版 on 灘投 then we not really need to discuss the 中通鉛 anymore, reason is the heaviest 中通鉛 always be the best. same as the line 40+lb Pe please. (If you give me to choice). Just my feeling ^^”