But. They're developer reasons.
What almost everyone who piles into this support of static stuff seems to completely ignore is the audience here.
Who do you think is editing your website? Amy the developer who has no problem committing stuff to Git or learning Markdown or Dave, who is a marketing manager and spends most of his life in Word writing press releases and social media posts?
The entire point of a WYSIWYG editor is that it doesn't require any developer experience.
If you genuinely think a corporate website can be run out of a Git workflow or a requirement to learn Markdown, you're basically in the wrong room. This is the whole "IT bottleneck" that content teams have been battling for years: it's back to the early 90's days of "yeh, we want to update our homepage but we need IT to do it for us".
Somewhere in the middle is the holy grail: performant sites that are also editor friendly.