In literally every thread about SpaceX people who don't like Musk (and sometimes others), people bring up Shotwell. Of course her name doesn't come up as often as Musk, Musk is literally one of the most famous people on earth, a highly controversial public figure and one of the richest people on the plant, who also owns and leads the company.

For most other tech companies people done even know the Nr.2 person in the company, and that includes companies much bigger then SpaceX. So if anything Shotwell comes up more often then literally any other Nr.2 person in a major tech company. I couldn't tell you the relevant people at Nvidia, or Google, or Microsoft.

Also the letter was more about the external image, that Musk reflected on them. There was no actual argument in the later work inside SpaceX was slowed down because of it. And from the continued progress SpaceX has made before and after that, there is no evidence of that it actually did.

But of course its also self evident that the CEO isn't doing 'boring day to day stuff', but neither is Shotwell.