I am not asking you to accept the burden of proof, just that somehow objective criteria need to be set to assess the L1. The burden of proof is then on the L1 to meet those criteria.

Also, I don't feel it makes sense to conflate all "other blockchains" and tar them all with the same brush, even if a very high % of them are shitcoins.

I have one L1 in mind. But I don't feel to show my hand to those who  have concluded that *all* other cryptos than BTC are shitcoins, or in a situation where there are no objective benchmarks and the goal posts keep moving!

(And please don't feel these points are in response to you personally. It is just that I feel to lay the ground as best as is possible, given how hard I feel it is for a L1 to gain acceptance.) 

 I am always open to discussions, and happy to take the time to verify things myself, if you can point me in the right direction, I run my own node, I have my own lightning node, I've tried liquid I actively use these things now

I've used EVM chains like ETH, BSC, I've tried out MATIC, I've used TRON they're all pretty much variant flavours of the same flaws. 

I've yet to see a blockchain that hasn't sacrificed decentralisation and simplicity for throughput 

 That all sounds exemplary, you are in a position to speak of your first hand experience of the merits/demerits of all those things.

Without further ado, here is a taster of what the #Nimiq L1 crypto payment coin offers. https://www.youtube.com/watch?v=dA40oyDVtqs