Yes, of course there can be several motives why to join a blockchain based social media platform.
Here I was only considering the topic from the perspective of what would contribute to or delay/prevent mass adoption of STEEM and the possibility to earn money there.
HIVE has its fascinating aspects, but I dislike the behavior of part of its leaders ... So I cannot do much more than waiting and see how things will develop on both sides of the big rift.
Maybe, as you said, both networks will occupy different niches of the crypto universe, aiming for different target audiences and thus will coexist in future.