Fees - I think it is hard to be too religious about the fee structure. There are many monetising models in the world, this is just one more. The market will figure that out, and it sees to work for Bitshares/Steem.

TPS - yeah any numbers are made up or guesses at this stage. That said, Butshares/steem have tested to 3300 TPS from memory. And the base technology has proven into the millions in a different context, when heavily optimised. We'll see.

DPOS - so - any system of governance is a "proxy" for the best solution, and for the perceived view of the community. Governance doesn't deliver mathematical results, which can confuse some. It isn't about the best, it's about coming up with a system that approximates a community's wishes and interests, and doesn't exhibit wild behaviour like forks and thefts. DPOS seems to do that, other systems might exist, but right now it's a lonely field.