It can be bad, but it doesn’t have to be. It’s not bad if you’re just using it as a tool and understand that it’s not your only tool. Heavy equipment operators use their machines like extensions of their body. It doesn’t mean it’s bad or that they forget how to use their arms and legs or that they don’t still exercise their arms and legs sometimes. Use tools when it’s appropriate to and don’t when it isn’t, and always make sure you can use a variety of different tools including the ones you were born with and you’ll be fine.