People also cite early stage google and intentionally do not buy ECC components, running more consumer hardware for production workloads.
Even if google later recanted that theology.
I think you hold public CAs to a higher standard than many hold themselves to.
There are hundreds of CAs and many (if not most) are shockingly awful.
Which is why we have had a huge push back against the PKI cartels.
But also, in this context we aren't talking about the CAs anyway, but the Log operators, and so for them reliability is about staying qualified, as otherwise their service is pointless. There are far fewer of those, about half-a-dozen total. Cloudflare, Google, Digicert, Sectigo, ISRG (Let's Encrypt), and Trust Asia.
[Edited, I counted a column header, 53 rows minus 1 header = 52]
Food for thought.