In my humble opinion -

We all now have access to the best bikes and the best components money can buy. True road racing cyclists are clipping in once at race start and (hopefully) the next time they unclip is crossing the finish line.

The Captain/Pilot on a Tandem has the responsibility for safety for two people. Unless you are racing, you will want to use a pedal which provides for quick access in and out so that you can focus on starting and stopping frequently and safely.

Use the right equipment for the right job.