sadly this is going to be a massive crashfest, as per usual nowadays in the tour. i cross my fingers everyone stays upright this time so we can have a spectacular final.
One of the conversations regarding the massive crashes early in the 2021 TdF was about le grand départ in Bretagne, namely the narrow, twisty roads & sketchy finales which might have contributed to making a stressed peloton with high stakes disintegrate in several major crashes. There was also the question of a lack of ITT prologue which means time differences aren't established as a 'deterrent', so we see everyone drilling it for glory in the first couple of stages.
Contrast that with last year when nothing much happened in Denmark (stage 3 had a big crash in the final km, I seem to remember). But yeah, judging by the recent history of this sport & the Tour in particular, I reckon Saturday & Sunday on these Basque roads will be carnage & some riders will lose their GC hopes right there & then.