It is not something that Microsoft can just do. Apple used their market share to get every one lined up (Apple uses Secure Element and has a slightly different set of concerns). Google with HCE has only just managed to get enough of the involved parties together. Major issuing banks ask for several million pounds to develop their HCE app and the back-end provisioning system. If there isn't improved security (hence lower fraud) there is no incentive to use NFC , tokenisation, so the credit card number is not stored on the phone, costs money to use. Key management and issuing has to be developed and implemented.
Microsoft has implemented the NFC messaging between the phone and POS terminal but they can not build the "right" content into the messages.
I should declare an interest here. I work as a the Product Development Manager on a project to use HCE for cardless / direct from bank account payments in the UK. There is a lot less support for W10 than Android in this area.
If want to compete in mobile arena, they better "do" it
