The fact: Strictly is very popular.
The opinion: this popularity is baffling.
There is an idealisation of the past (well, there always is) as shown by the constant stream of costume dramas. But it is ridiculous to attribute the popularity of the show to any one thing. It is not Bruce, it is not the nostalgia of seeing dances such as the foxtrot, it is not the celebs, it is not the judges, it is not the music, it is not the pros, it is not the dancing, it is not the voting format, it is not what the press makes of the show etc. For each viewer, it is a different mixture of some of the above (i.e., for me, it is the pros, the dancing, the music. To a lesser extent the pros. Bruce, the judges make little difference, though am increasingly turning off the current judges.)
While the attempt to analyse the popularity was admirable, it seems obvious that whoever wrote this missed the point.