I can help shed light here. Postgres doesn’t make you choose between two storage engines and their compromises. It’s been years, but last time I looked the trade offs between MySQL storage engines were material and the newer engine was missing some valuable features of the older one. The advice was “pick the right engine for the job” - but I don’t want to, that another decision I have to make, why make me do that? At least until they come out with a new storage engine that’s “objectively better than Postgres”, I will enjoy the simplicity of using Postgres with its single storage engine. Choice isn’t always better.
I searched to see if anything has changed and found that InnoDB doesn’t support full text search - give me break, after it’s been the default for years, you gotta be kidding. https://hevodata.com/learn/myisam-vs-innodb/