Why would they be looking at the version control system for this? That is not what it's there for.
And many tech leads simply don't have the time to review every single WIP commit. They want meaningful message/description of the big squashed PR commit. If you just post a merged list of all commit messages with 10x "fix stuff" inside you'll be in big trouble the next time around and your work will be inspected very closely.
The practices I am describing to you are reality in many tech companies. Writing code there is not about you at all. And almost nobody will read your code and PR descriptions unless they really have to. Hence it's a professional courtesy to make those as small and meaningful as possible.
Do you usually review every commit? I usually just review the diff between the PR'd branch and master, as does everyone I work with.
Whether you think that "makes no sense" is inconsequential. Many people find it very meaningful.
Indeed they are, hence the need to rewrite the history. Managers, tech leads, or users of your OSS project don't care about the "fix typo" comments. They are interested in a meaningful history that tells a bigger story.
And to be frank, I am interested in the same, mid-term and long-term. While I am grappling with a very interesting problem for a month then yes, I'd love my messy history! But after I nail the problem and introduce the feature I'll absolutely rewrite history so the squashed PR commit simply says "add feature X" or "fix bug Y".