Your connection won’t support XGS-PON though, they’re incompatible directly. Even if XGS-PON is in your area, the port your line is connected to will be GPON only until you’re upgraded. There would be little benefit of upgrading in your case, even if the new ONT is backwards compatible.I am currently using the Adtran SDX 611 GPON ONT installed by openreach. I would like to switch to the Adtran SDX 622v XGS-PON ONT that I am considering to buy instead, is this possible?
Quite like the idea of having a Mikrotik router all-in-one solution, that's really the only benefit.and and and what is the purpose of changing the ONT anyway? The supplied one will provide the service you are paying for. It's not like *DSL where you could try one with a different chipset and eke out a bit more speed, lower latency or some additional features. There are no stats that need to be read off and obsessed over.
I know some people insist on fiddling with things that they literally should not be touching (the ONT is the modern equivalent of the master socket, you can connect to it and not much else) but there's not even a benefit to doing so.