Not a crazy set of guiding concepts/principles:
1.) Limit utxo growth (via block weight constraints, and by avoiding creation of utxos that would be uneconomic to spend)
2.) Prefer that transaction data be prunable rather than potentially permanent (eg, better to have a 20-32 byte hash in the utxo set and a 160 byte x-of-5 multisig script in the scriptSig or witness, than to have the 160 byte x-of-5 multisig directly in the utxo set; this is the main justification for why witness data should be discounted vs output data)
3.) Limit block validation time to the ~1s range (on a block whose txs have not been seen before, on reasonable hardware)
4.) Limit maximum block size growth to ~4GB/week (ie, the worst case from having a 4M weight limit)
5.) Optimise validation and relay of blocks with txs that we have seen before as much as possible
6.) Allow anyone to create any sort of scripts they like (via p2sh, p2wsh, p2tr), within the limits of what you can conceivably do with script opcodes, and without causing excessive validation costs
7.) Encourage people who want to use the blockchain as an anchor for their data to store commitments in the blockchain rather than the actual data
8.) Allow miners to occassionally generate excess profits by mining non-standard transactions that violate relay rules but comply with consensus rules
