E-bikes are not for lightweight commuting

Last summer I saw more and more people with things that looked like racing bikes but were a bit more sturdy and at the same time seemed - I don’t know how to put it - casual (?) to me. I looked around a bit and learnt that these were “gravel bikes” that I had heard about before. For some reason I had always imaged “gravel bikes” to be those mountain bikes with really fat tires. No idea why. All of a sudden, though, I was interested! That could be something that could help me work on my fitnes...