Not really. Only if you think the plant is having an issue. Even growing in an organic mix its not mandatory to repot every year. Its all about finding a balance between your growing style and a plant's good health. In fact I believe the fewer times a plant needs repotted is a reflection of the great culture its been given.Is it necessary to repot a plant that has been reported in an inorganic media on a yearly basis like those in a bark based media?
An inorganic potting medium can't decompose or decay....so there won't be a reason for regularly repotting. Their might be two reason for repotting.....if the potting mix doesn't work or if the plant gets too big for the pot. The latter is the better one. I think too as Rick already mentioned...the less repotting the better. BTW I grow some of my Paphs more than 10 years in the same mix and pot.Is it necessary to repot a plant that has been reported in an inorganic media on a yearly basis like those in a bark based media?