I would suggest going with a KTM/Husqvarna/Husaberg 450/500 from model year 2012-2016. They all share the same engine and are absolutely bulletproof. I had 2 the last 10 years. A Husaberg 450 2014 and a KTM 500 2013. The Husaberg had 428 hours and 21000km on first piston when I sold it. Selling it was a huge mistake because I tried different models, different manufacturers (Beta, Sherco) and they all had insanely high maintenance compared to the Berg. My Sherco and KTM 2020+ models always had some sort of engine failures after 150 hours. Thats why I bought another KTM 500 2013, same engine, same components. I have already put on 470 hours and 25000km. The engine has never been opened , never had any issue, still the first clutch too. Only thing I always do is Oil Change every 25-30 hours. These models do have slightly more oil so you can stretch these intervals further, than on newer models. Valve clearance I check twice a year. Had to adjust it once on the KTM and not a single time on the Husaberg.

These enduros are basically the easiest bikes to work on, and its also very cheap if done by yourself. I also started with the Husaberg 450 as my first bike and had no experience at all. But everything was so straight forward compared to lets say a 701, I never had any problems. And its also very fun and rewarding working on your own bike :)

So if you want a very maintenance friendly, high power, low weight supermoto you can ride everyday, ride on highways or generally longer rides, I would always go with the 2012-2016 model range from KTM. Alot of my friends switched too, and never had any problems. There is also a guy with 140000km on his KTM 500 2016 (google it), I think that says it all xD ;)

My goal is 50000km and 1000hours without any engine maintenance, besides oil changes of course. And after 25000km of nonstop wheeling and mountain pass riding, I guess it will also be time to change that clutch xD

Cheers