It's not about ability, it's about laziness.Don't know why the insulting writers is always given a free pass and centers around ability. It is quite disturbing to me though.
We have this thing called "The Internet", and there are TONS of resources on Star Trek, including what happens in ALL of the previous episodes.
They can literally go to Memory Alpha or any countless other Trek Fan sites for info on past Trek details & continuity.
It's literally typing a few words, and reading up on what happened.
Maybe watching a few episodes, then boom, you did your HomeWork.
Then go write the episode you want to write and include previous content or find ways to not introduce conflicting info with previous continuity.
That's basic due diligence as a writer.