Not sure where “over a dozen Scottish programmes” comes from, unless you are including the weekly country music and more pop orientated ones?
Radio Scotland has been progressively reducing its music output over the years, in favour of more chat shows and sport. Travelling Folk used to be on twice a week (same programme but repeated.) The Reel Blend was axed a few years back, and Take the Floor, for the dance band enthusiasts, is down to one hour. Then we have the Piping programme, but the rest doesn’t really fit the folk and trad genre, apart from some of what Iain Anderson plays.
But yes, we have BBC ALBA to be thankful for, albeit multiple repeats shown.