I have used Mikrotik products to interface to the NBN just fine for years now. Devices include RB3011, RB4011, hAPAC2, CAPAC, hEX and the hAP Mini to FTTN, FTTC and FW - I have yet to see a FTTH connection as they are super rare where I am.
They all work just fine. In your case you need a VDSL2 modem to give you an ethernet port for the Mikrotik to plug into. You can use many of the nasty ISP modems to do this if you put them in bridge mode. They work just fine as VDSL2 bridges. I have set up Telstra TG799VACs, Draytek Vigor 130, Netcomm and Netgear devices to do this. If you get a Routerboard with an SFP port you can also plug in a this Proscend VDSL2 SFP module: - https://shop.duxtel.com.au/product_info.php?cPath=24&products_id=488
The Telstra TG799VACs are no longer supplied but are cheap and still in the wrapper off eBay and make great FTTN bridge mode devices.
xDSL is old school but we’re stuck with it now in spades in Australia for a long time to come now due to politics. Don’t get me started.