If I am looking for a segment of, for example, 10 kilometers in a region with many segments, I will not be able to find it immediately because there are many other and many shorter segments visible. This is also the case when I'm looking for descents. If you zoom in on a col, you will see many short segments, including segments such as "steepest part". Even when selecting the "U" (flat/downhill) category, segments of, for example, 15% uphill still appear. Not really flat or downhill. If I now want to search for an excisting specific segment, I first select a short segment that is similar to the route I want to cycle. Then, from the list of people who have ridden this segment, I select a person to look at their activity. In the hope that this is an activity where a large part corresponds to the route that I want to cycle. If I have found such an activity, I can look at all segments that have been driven during this activity. Often there is therefore the segment that I was looking for.
If there were more filter options for segment searches, the search would be much easier. Filters that can also be combined. Think of filters such as; Length from x km to x km Minimum and maximum number of altimeters Descent or climb Average slope rate
For example, take a look at the Alpe d'Huez; How many short segments "bent x to bent x" are there? And even "La Marmotte 2011" a segment of 176km is in the list! This while I only zoomed in on the Alpe d'Huez.
Search for a segment from 10km to 15km, with a minimum of 1000 altimeters shall be much easier.
Searching via the telephone app is much easier than via the web. But I don't make my routes on my phone.