NWH confusion/question *spoilers*

Why did they make a specific point about saying strange no longer has the time stone and then have him wear the eye of aggamoto through the rest of the movie but never use it for anything? I just found that very confusing. Why didn’t they just leave the eye out completely?

Honestly for a lot of the movie I thought that it was a clue that we had moved into an alternate universe, but there was never any reveal so I guess I was wrong.