'A settlement layer must be globally liquid'
Depends on how liquid it needs to actually be, but yeah with BTC not getting delisted any time soon (probably) it's liquidity will be better than XMR's for the foreseeable future.
'predictable'
Monero's supply is as predictable as Bitcoin's. For the rest of time it will increase by ~158k XMR per year, which gives it currently basically the same inflation rate as BTC (about 0.85% p.a.).
'neutral'
What ever is meant by neutral? Monero has basically no concept of tainted coins and no mining pool can censor any particular TX or user (thanks to the privacy), so it's arguably more neutral than BTC.
'secure'
Monero's network is very similarly secured to BTC's when it comes to the ratio of 'electricity needed for mining'/'marketcap' and 'cost of mining hardware'/'marketcap'
But when it comes to security for the user, Monero is much more secure (especially for the not so techy user) thanks to the always on privacy. I can introduce my grandma to Monero and don't have to worry about her exposing her wealth to the whole world etc.
'widely accepted'
In Europe you can basically buy everything except houses with Monero, as there are lots of giftcards for different stuff available and thanks to services like ShopinBit/ProxyStore.
But let's not fool ourselves here, the general acceptance rate of Crypto (regardless of which one) is way to low still.
'Bitcoin is the only digital asset that satisfies all of these simultaneously.'
That is, as I have argued above, not true.
