But where do you stop? The Highlander has more than 2x the power of the Micra and can easily climb any road that it comes across at the speed limit or well above. Cargo space? Way more. Room for passengers? The rear seat area probably feels as large as the entire Micra. A new Highlander is even larger and more powerful.
But, then the price is much higher, and fuel consumption is also much higher.
I've driven a Micra, and it's a pretty decent car. I wouldn't buy a top trim level of it, as I think the real value is in the $13K-ish model. It is true that the compact sedans offer a lot more in many ways. A Corolla or Civic offers more power, more room, comfort, etc, and at pretty much zero fuel economy penalty. BUT, the prices of those cars are higher.