My highest praise goes the other way around. Id say the cause is cost - it will cost you a lot more to dive in FP than it will anywhere in Asia. It will probably cost you a lot more to get there - $600 - $700 airfares return get me to Sorong to meet a raja liveaboard while the cost of airfare to Tahiti was $2400 plus another $800 for the Tuomotos (I bought an inter island air pass) plus each meal will cost you triple and each taxi fair is quadruple that of Asia. Its a long way to get to from anywhere and really there is not a lot to do other than dive in the entirety of French Polynesia let alone the Tuomotos where you have a strip of beach around a strip of coral in the middle of a big ocean with a small village or a supply store thats open for a few hours a day. From where I live there are 16 flights a day to Indo, to Tahiti there are two flights a week with easy connection and only a few hours layover.
Land based diving in Asia you are never too far away from a city with shopping, attractions, temples, markets etc - in French Polynesia there are the Marae's and a few other cultural based things to do but unless you want resort style activities offered by the resorts like paddleboarding you can basically see most islands in a day.
In Asia, massages and wandering up and down streets deciding where to eat is affordable between dives, in French Polynesia...not affordable and you need to go to a hotel spa and be ok with prices like $180 for a massage.
Asia to me now is about diving to find critters more than anything, French Polynesia is all about the big stuff and those big current drift dives.
Id say the simple answer to your question is more people have dived Indonesia and Palau therefore more threads.