Not all FS bikes are ridden all year round, many go to hard tails , SS , fat bikes ect in winter to reduce wear and tear on their full sus bikes.
I ride a full sus all year round, so maintenance is a parameter I consider, when buying, as I usually keep frames for 4-5 years.
For the most part, if a reasonable mechanic it is no problem multi or single pivot, however depending on the design the multis, some do need drift tools, bearing extractors to renew bearings, therefore ( for me anyway) that would mean a trip to the LBS, and it always seems to happen at the wrong time!!!