Improvement scope

Ref: https://i.imgur.com/1On4z3E.png

Affect: Caching stuffs in unexpected way.

Fix – comment out / remove it

// 'ExpiresByType text/html "access '.$expire.'"',
// 'ExpiresDefault "access '.$expire.'"',

Why?

text/html should never be cached in the browser for long TTL, and setting up ExpiresDefault would accidently start caching stuffs that you have not explictly mentioned by its mime-type.

How user can face problem, I guess here’s one example
https://wordpress.org/support/topic/important-caching-does-not-refresh-after-adding-new-posts/

Thanks