A survey of cryptocurrencies showed monero has failed to achieve this goal of being a superior form of digital cash, relative to most other crypto currencies in similar 'weight class' of market cap and years available. This failure isn't technical, it's due to relative weaknesses in the realms of politics and soft social influence. Even the lower market cap LTC is more accepted as 'cash' by most legal vendors.
-----------
re: below muh sources
getmonero.org, OPs referenced website, advertises cryptwerk as a good directory.
Go to https://cryptwerk.com/pay-with/xmr/ and compare it to https://cryptwerk.com/pay-with/ltc/.
There are ~twice as many for LTC for example, and that's being charitable with something with a lower market cap rather than BTC which is like 3+ times as many.
(2) The top merchant directory recommended was 'cryptwerk'. Follow that through
(3) Compare https://cryptwerk.com/pay-with/xmr/ to https://cryptwerk.com/pay-with/ltc/.
(4) Note there are 2x vendor for lower market cap LTC, 3x as many for higher market cap BTC. Note this directory was chosen by monero people themselves, so I'm not cherry picking something gaming the merchant list against monero.
There is a pretty consistent survey of XMR performing weaker than similar class assets in spending at crypto accepting vendors. (Note I had to reply above earlier because my account was throttled)
[0] https://getmonero-redesign-impl.vercel.app/get-started/merch...