Good point. Having a lot of stuff does not necessarily mean that you over prepared. It might mean that you under prepared by throwing stuff on the bicycle willy nilly without much thought about whether or not you will need it or want it and can justify hauling it. OTH you might have a lot of stuff with you in spite of carefully thinking it through, simply because your plans require it or those things are important to you personally.

The key is to think about the items you pack and whether they are worth the effort to take them with you. You can learn how to make those decisions a little more wisely by recognizing that most newbies over pack. I would suppose that's because people don't appreciate the true cost of the pack until they get some experience riding day after day on hills, maneuvering the bicycle around in various ways, packing and unpacking at your campsite, etc.

I think in my early days of touring I was pleased and excited about how much I could load the bicycle down and still ride it. I went on some early test rides and thought "wow, this is great. I can take whatever I want to". That led to over packing just because it was cool that I could travel in luxury with whatever I needed. That zeal wore off some as I more slowly realized that just because I can do it, does not make it the most enjoyable way to travel.

That said, my pack is heavy compared to many, and may always be (until I'm older and less capable). Where you fall on the ruler of low weight to heavy weight is ultimately based on very personal decisions.