Greetings from London. I write this while wearing my Rothy’s Round Toe Flats.
They are perfect for short-ish walks (defined as 1.5 hours at a time). I wear mine all day to work. I walk a lot and travel a lot. I am in my early 40s if that helps.
Last week I wore them on a 1.5 hour walk through the streets of Capri. For longer walks at a time, and especially over rocky terrain, I wear tennis shoes/sneakers.
So, it depends on where you plan to wear them and how long you plan to walk in a stretch.
A final point, I love the Round Toe Flats but found their pointy flats to be painful.