You have:
- Best route (read: fastest)
- Fewer transfers (kinda like asking for just only layover even if it’s longer and you get in later)
- Less walking (for someone who can’t walk far distances, hot days, etc).
The first one is optimized for speed. Most walking would be to walk the entire way. What’s the universal sweet spot for more walking? How much speed/time would anyone choosing that option be willing to sacrifice? My guess is it varies widely, even for the same person depending on where they’re going, whether they have to be on time, how tight their schedule is, etc.