My sister is driving the previous gen Forester and she also don't know about cars, but luckily i knew the mechanic which can fix Subaru so no issue for her.
Same as any rides before buying, get info who can fix the car first (outside specialist) and is the SC nearby supportive or not? Join in respective group like Subaru Xv Malaysia group in fb or forums and ask for info.

Nowadays modern cars is not like those in 90's anything also simple and use similar oil & parts. So you will need specialist or proper mechanic to advice and help maintain. Even Axia my mechanic already encounter a lot of poor condition due to non-proper maintenance (Wrong, poor engine oil spec., spark plugs, mounting issue) given by roadside/tire shop mechanic.  Until teruk then go find proper mechanic to diagnose/fix... 

Rx7/8 my mechanic got few customer, the main thing to maintain is to get the correct specification/oil grade for different engine type. Rotary engine apex seal cannot tolerate synthetic oil well and the engine itself design to lubricate the apex seal with engine oil. If you manage to get the original manual book from Mazda most recommend 5W-30/10W-30 mineral oil only. (It highlighted only mineral oil in the manual book)
My mechanic already seen quite a lot of rotary engine fail due to use of wrong type engine oil, some workshop will try sell fully synthetic is the best and any engine also can use.