Personally, I don't have a tablet; if I did, I wouldn't care if the data uploaded through it or through my phone as long as it got where I need it. I'm guessing at the numbers, but probably 99 % of the Edge units ever sold are used with a USB computer or a smart phone. It would be nice to have more options to get at the data, but somewhere along the way a project manager weighs the costs (hardware, software development, battery) against how widely a feature will be used, and makes a decision.
Do you need to see the data while you're on tour? I would think the map is the most interesting part and you must already have that worked out...?