If you read the announcements it explains why they are doing it.
PHP is a community driven project, comparing that with C# or Java is a bit unfair because they are backed by companies worth billions.
What you describe about Zend I think that is more the old days before PHP 7. I don’t have the full picture of this but my understanding is that because of the failure of PHP 6 (never released), another group of developers from the community started to work with PHP 7 and I don’t think neither of them was from Zend.
Today there is an open RFC process and anyone can submit an RFC and then the core teams votes on it. If you contribute to PHP you can become a member of the core team.
https://wiki.php.net/rfc
If you want to be part of the discussion you can join the internals mailing list. Here you can read it without joining.
https://externals.io/
If someone is unhappy with direction of PHP my advice to them is to start contributing, bug fix, write documentation, translate, write RFCs, implement functionality, code review etc. Why? because PHP today is a community driven project.