and ? lots of drivers could have won championships sooner without mistakes. It's hardly a unique trait to Norris.
You keep talking about his mistakes, poor starts etc as a sign of him being weak but you seem to purposely be ignoring the fact that he went on a run of consistantly outperforming his team mate at the most clutch point in the season, pulling back a large points gap at a time when he couldn't afford any major screw ups. He went from almost being out of the title race to leading it, and would have won the title earlier without McLarens technical issues. This against a team mate who has been highly rated for a long time, even before F1, a team mate half this forum thought was a future champ at one point (he could still be)... all whilst having social media call you weak or a bottler.
Im not saying Norris has driven some flawless amazing season, max has been the best driver but your outlook on his performances are extremely one sided to the point you will ignore the good run he went on that turned his title bid around and instead focus on small mistakes, mostly at the start of the season.
It seems that because Norris has outperformed Piastri, the view amongst some is that rather than Norris being good, it's actually just Piastri being poor and they are both in-fact mid. It's a view commonly held and sold by Red Bull/Max fans. Im not sure why they feel the need to do it given Max is universally viewed as the best driver by some distance, but i guess dumping on ones rival is a tale as old as time.
Also i think you need to factor in that this is Norris and Piastri's first time in a truly high pressure environment, they are not seasoned veterans of battling for titles. The first title is often the hardest, and it gets even harder when you have arguably the greatest driver ever chasing you down and making no mistakes in a car which on its day is still very competitive.
TLDR - You're overly harsh on Norris