Whilst I can see your point about the yellow strap, TAG Heuer probably think that it would reduce sales as is more out there than a more standard blue strap. What they’ve missed is that this is an LE specifically for Senna, so the same people will buy regardless. A yellow strap would be therefore have been fine, albeit needing a redesign of the other areas of the dial, more in line with the other models in this range.
I like it overall, but hate the continual habit of cutting into the chapter ring in order to squeeze the tourbillon in. Always spoils these designs. Same applies with chronographs where they do the same.