I think this is a good point, however over time I believe less and less of option (2) will be used. Option (1) will become ubiquitous, and it is important it is done well. The researchers signing the letter should be exactly the ones helping improve the models used, as they obviously care enough to consider the inherent biases and societal effects.
Just because they choose to "opt out", it doesn't mean everyone else will. It leaves the task to a smaller pool of competent people (best case), or unscrupulous people out to make a quick buck or push an agenda (worst case).