Hi John, 
In my opinion, a car park (amenity=parking) is a collection of parking spaces (so is a camp_site a collection of camp_pitch, a tree_row a collection of trees etc...). The question is if you can only park 1/2 cars, does it make it a car park? I do not think the original idea behind amenity=parking_space was intended for this kind of micromapping, namely outside a proper parking lot. As you pointed out, it can easily get tortuous to link them together. The wiki is insisting on starting with amenity=parking to avoid situations such as here: https://www.openstreetmap.org/way/1005597115. For isolated parking spaces, I am perfectly comfortable with not adding an amenity=parking (https://overpass-turbo.eu/s/1PJg) as long it is somehow reasonable (1/2 maybe 3 cars) and usually if it has a purpose (personal point of view here). The thing with parking lots is that you have to 'zoom out' a little bit to let some form of hierarchy emerge: as its stands OSM is pretty close to the camp site map (https://www.yellohvillage.fr/camping/la_capricieuse) and surely not everything is considered as car park by owner! A customer or visitor should expect to be able to park their car which may be not the case in front of each bungalow. I suppose it is a matter of striking the right balance particularly when micromapping. I hope you are enjoying your stay in Normandy.
 Cheers! David