The standard stereo in the Tiguan SEL I have is perfectly good enough and better than you get in most cars. Unless you want to have the volume up to 11 don’t waste your money.
I have 2 home cinema systems at home with one costing £15k+ so appreciate good quality audio. I am assuming that the one in the updated models(Elegance) are at least as good as the ones in the SEL.
Pan roof is nice but only used mine open 2-3 times a year.