For me, tech has to mean something that I don’t clean first time and end up going back and redoing until it’s ridden or something which I look at and gives me a little bit of the fear.
One man’s “piece of piss” is another’s “quite hard actually” but my favourite tech descents are, in no particular order, Glas Alt (rode it recently and loved it), Ben Lomond, Ben Lawers top section (bottom is really flowy but not tech), the steep stone pitched steps on Mealle a Buchaille, Ben Vorlich top section, Cairn Toul rocky switchbacks of much rockiness, Jocks Road, Ciaran Path though it is more of a traverse, one of the steeper descents into Kinlochleven from Mamore Lodge, the steep scree laden descent from Beinn a Bhuird to the bealach with Ben Avon and the descent of MacDhui to the Hutchy Hut.
However, there are so many more to be discovered – on my radar is the Ring of Steall, Ben Cruachan, Beinn Glas (walked up it on the way to Lawers – it looked stunning)amongst others. For me, big mountains are generally the way to go when it comes to finding sustained technical descents.