So the 2017 Lexus NX 200t have been discontinued. How difficult will it be to aitserviced

Hello, Lexus like most manufacturers will support "legacy" parts for a vehicle like this for some time to come. Keep in mind that some 2017's might even still have factory warranty left on them depending on when sold, and the powertrain warranty is definitely still in effect if under 60,000 miles. The vehicle also likely shares parts with other Lexus or Toyota vehicles too - so they'll still be available a bit yet. If this was a 2007 -- I'd be more concerned, but for a 2017, I'd say risk or concern should be quite low.

The 2017 Lexus NX 200t was never discontinued, its name changed to Lexus NX 300 and Lexus NX 300h in 2018, that simple...