It really depends on what object you are talking about and how you use it in your environment. For example, bathroom cleaning supplies. If you only have one bathroom it's not an issue. If however, you have 4 or 5 bathrooms on different floors then you may want to reconsider. It will actually simplify your life to have cleaning supplies in each bathroom - no lugging them around and more spontaneous mini-cleans.
I find that to have 2 spatulas, flippers, scissors and tongs in my kitchen makes my life easier. They are all used, often at the same time so I do not consider them clutter. This applies to many random items that I have more than one of because of how and when I use them.
Think about how you use certain objects or tools in your home. Maybe having duplicates does simplify things for you. Maybe it doesn't or maybe you may feel more is necessary for you. The point is that if you do have more than one of something then have it intentionally not just because it's there.