Comment by prmoustache

In the MTB world they invented dropper seatpost which allows the seat to slide up or down depending of the riders need. Usually they want it out of the way in the downhills.

Turns out it is also really useful when you are using your bike in a urban area and want the seat down at the traffic lights and I can see those becoming popular on city bikes in the next few years.

Right now there is one particular city/step-thru kind of bike that sports one because it is built to also handle dirt paths:

The Marin Larkspur 2 https://www.marinbikes.com/ww/bikes/2021-larkspur-2

So you could totally buy a bike this bike in your size, sliding down the saddle and removing the pedals to use it as a balance bike for a little before you get confident enough to use it with pedals.

Additionally I think it looks super cool. I don't need it, yet I want one for myself. I think they just released an e-bike version that I may gift to my partner.