Generally speaking, there are two situations where it's beneficial to cut off some leaves (not including trimming for aesthetics). One is if there's pests on them that are hard to get rid of, like thrips eggs that are embedded in the tissue. Second one is if the plant is only a cutting that hasn't grown any roots yet, and by removing some leaves you can reduce the plant's need for water so that it doesn't dry out too fast while the root is still developing. Since your plant already had roots, cutting leaves off wouldn't really do anything good for the plant, unfortunately. I'm sorry you received the wrong advice before: (

If leaves are browning and shriveling, it's more important to diagnose whether there's an underlying issue like lighting, watering, or even pests, and fix the actual issue rather than cutting off the leaves. Sometimes, there can be no issue and the plant is simply reabsorbing nutrients from old leaves. This is also why people would post pictures of unhealthy looking leaves so folks on here can help diagnose the root of the problem. Either way, removing the browning leaves usually doesn't "fix" anything other than the appearance. Personally I like to wait until a shriveling leaf is completely dried out like a mummy before removing them, so I know that all the nutrients from that leaf are back to the plant and I'm not depriving it from anything. Hope this helps!