I think its perfectly alright for Tudor to remove the more 'functional' aspect of the Pelagos 42 for the 39, ultimately they're looking to sell it as a 'fashion' accessory with some dive functionalities vs the other way around. The marketing material made that quite clear too.
As for colour options, I'm sure in the next few years they'll introduce more colour choices, similar to what they've done with the BB58 line.
But having said all that, just the proportion of the BB58 alone makes me a bigger fan of it vs the pelages 39