I think that whenever Pinot falters, people are quick to revert to the image of a suffering 2013 young, inexperienced Pinot, who had the weight of France on his shoulders, and who became paralyzed when descending and bonked when the sun was shining. They don't see the guy, who had the tenacity to bounce back from these very same, heartwrenching failures and improving himself further year after year. I get that to a degree. He is one of the strongest climbers in the world, I dare say, but unfortunately he has been in the wrong place at the wrong time one to many times. There is a pattern, these DNFs, that are increasingly difficult to ignore. You could string together a reasonable argument, like people including myself do with Richie Porte, that this man isn't cut out for Grand Tours. When push comes to shove, something gets in his way, whether be a crash, a handlebar, a puncture.
I would argue, that people tend to forget these two seemingly forgettable, but crucial points regarding Pinot and what differentiates him with what I would argue are lesser and/or fragile riders like Porte. Firstly, the very same people rushing to point out his numerous failures, either downplay or forget the fact, the he has bounced back every time. His failure in 2013 was followed up by a podium, which could have ended in a "mere" top-5, if Contador and Froome stayed upright. His early crashes and mechanicals in 2015 which put him out of GC contention, saw him bounce back, sit with the favorites up Plateau de Beille (not the most exciting stage though) and finally a stage win atop Alpe d'Huez. His 2016 DNF (one of the most forgettable Tours along with 2018) ended his season, but in 2017 he kicked it up a notch by beating Valverde and Contador in Andalusia and proved that his 2014 Tour wasn't a fluke by finishing 4th in the Giro and riding with the best in the 3rd week and a decent autumn campaign. His 2018 Giro ended with him getting sick after Froomexplosion, but when everyone again wrote him off, he bounced back in a strong, albeit slightly inconsistent Vuelta and had a blistering autumn campaign, where he put then TDF-stage winner Roglic to the sword, showing a higher level than ever before.
Secondly is that Pinot showed both in the 2018 and 2019, that when there is no freak injury, only guys like Froome and Dumoulin have been able to ride away from him. Frequent visitors of this thread, whether fans or critics probably don't need to be reminded that he put everyone including the highly-rated Bernal, touted as Roglic's bane, in their place last year, whether on Tourmalet and Prat d'Albis. I haven't seen Porte do that in any Grand Tour since, actually except Froome's (in)famous Ax-3 and Pierre Saint Martin victories, where Porte was merely a helper, but that is beside the point.
Do these freak injuries say something about his toughness? They do suggest a physical fragility, but mentally? I don't think you do find many stronger than him in the peloton in face of adversity. What I find alluring about Pinot as a rider is besides his attacking spirit and combackstories, is that his peak/injury/accidentfree level is matched by very, very few in today's peloton, but like a delicate piece of art, a slight error or a coffee stain can ruin the the whole picture. And I guess I find it a shame, that people disregard and fail to see the beauty of a painting because of the stains it has. After today, I don't think that the painting will ever get a makeover, but that shouldn't diminish its true beauty or vitality. Pinot will most certainly never win a GT anymore, but to say that he never had it in him or that he wasn't a great stage racer...that I regard misplaced.
For now, I think that polka dots would suit him, but losing 25 minutes because of his back makes me think, that he probably won't recover to make repeated efforts day after day. If FDJ don't think a stage win is likely, he should pull out and focus on other races instead of finishing for the sake of it. Hope he gives the Ardennes and/or a Giro-Vuelta double a go in the coming year or two. Tour de France and Thibaut Pinot aren't meant for each other, it seems.