Why do we never hear the word "divers" meaning "various" or "several" any more?

There are words that have become less used over time....it’s the evolution of language.
Many words fall into this category, and are sometimes referred to as obsolete.
In this case, “divers” was a “Middle English” word which has evolved into “diverse” in most places....though it was still in fairly common usage a few decades ago (dictionaries even vary as to whether “divers” is classified as obsolete or not).
Some words will remain in disuse, and some will enjoy a revival ( “bigly” was hardly ever used any more up until a few years ago).

We do, but we spell it with an "e" on the end.

I use that word frequently... in French

I think it dropped when the churches realized nobody could understand the language in the KJV and switched to a more modern transaction.

I’ve heard it lots... it’s in the Bible... 👍🏻

I use those words a lot of the time. Especially when I am talking about scuba diving or talking to other divers.

I use the word "several" quite often...

"Diverse". I hear it occasionally.