[SteveRW]

If it really had been the intention to apply the lens effect to the Shaun the Sheep idents, then it would only have been to their detriment - it would have introduced unnecessary extra clutter and obscured the main action in the centre of the screen.  I think those idents worked perfectly well in the simpler form in which we saw them. 

And if it's correct that this year we're getting a 'ragbag' of past idents, then this reminds we of what we had from BBC2 around the mid-2010s - a jumble of old idents from different eras, in that case made worse by the addition of some terrible soundtracks: theident.gallery 

From what I can make out, it isn't so much a "ragbag" but a re-use of some of 2020's with two new additions to bring them up to date. 

I do remember those re-uses of BBC Two's idents and the "Two two two two two two two" choral soundtrack to the melody of Deck The Halls. They were terrible.