Well, there are also city people who have always lived in apartments without balconies and actually have no idea at all about anything that grows out there.
Starting with a landscape gardener is a good beginning. Personally, I wouldn’t do it either, but my parents, for example, had it done by a gardener about 25 years ago and were very happy about it. He selected plants, ground covers, etc. and already placed them on the areas. My parents only had to plant them back then.
Not everyone has the time and desire to deal with soil, light, water, and the like for the right plants. It’s definitely better than a gravel garden or a 100% lawn area.
The price doesn’t look overly expensive either. Go to a garden center and buy plants for hundreds of euros. You come home and they just disappear on the property.