The way I am interested in this topic is from the point of game design. I can totally see a valid reason to ignore the powers roleplay-wise. But is it ok for you players to have that sort of disbalance between the options? Or if you think its balanced, can you elaborate why you think so?
I can totally see the sweet payoff of avoiding the mind melting powers of the larvae, but how could the plot only gains counteract the plot/gameplay gains from the illithid route?
If we stick with only the narrative payoff for the healthy brainers, won't it create a disbalance between the game systems and what they can offer for different kinds of players?