Yes, the bridge is a good analogy. You rightly say it doesn't care about the type of cargo, only the load. This is exactly what BIP 110 proposes. It doesn't distinguish between the type of data (cargo...
The load is priced, not 'too much.' Blocks are full because people are paying to fill them. BIP-110 doesn't fix a collapsing bridge. It kicks off the paying customers so your preferred cargo gets through cheaper. That's not engineering. That's subsidy enforcement at consensus.
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