You ran you’d rather be able to add your transport card to Wallet right? because you’re using the NFC chip either way when you pay, but with the transport card it’s always cheaper than paying with a regular credit or debit card. It will take them longer to support adding transport cards to wallet though, if they ever do.
Also, you don’t seem to quite know what express transit mode is. Express transit mode allows you to pay your fare by just waving your iphone or apple watch near the reader, without having to authenticate with fingerprint or face, and it works both with credit and debit cards and with local transport cards (if a transport card can be added to wallet, express transit mode is usually also available for that card). So, my point was that you can at least use apple pay with your credit or debit card, and also ETM, while they enable adding your local transport card to wallet (which may take a long time).
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If you could add that card to Wallet, then you’d be able to use express transit mode with that card. Express transit mode already works with local transit cards in some places, let’s hope The Netherlands later becomes one more place where it does. Problem is these things seem to be mainly sales gimmicks Apple uses, and they are hardly if at all adopted by people and companies in the real world. Look at “sign in with apple”. Real easy to implement, yet hardly any websites/apps at all are supporting it three months after its launch with iOS 13.