Interesting! I hadn’t heard of power being restricted based on license type before. Here in BC Canada, you can ride whatever you want when you feel you’re ready (which has its drawbacks too). That said, licenses here can have engine CC size restrictions depending on what CC of bike you choose to use for your road test(s).
Anyways… I took riding lessons at a fantastic local riding school and learned on a Kawasaki KLX 250 (I think). My first bike was/is a 2015 Ducati Scrambler Full Throttle (now had for 3+ years and 22,000+ km). Ordered a 2023 MT-09 SP for my next bike (expected to ship in April). So I’m stoked!
As for yourself, at 18 the next bike you get probably won’t be your last. If the MT-07 and MT-09 have similar power available due to local licensing restrictions, you may be better off with the MT-07 for the greater fuel economy then a couple years or more down the road sell it and upgrade to the MT-09 (or whenever your license will allow you to ride it unrestricted). Just my thoughts on that.
Then again, if budget isn’t a concern then go with your gut and get whatever will make you happiest!