The interesting thing with transit is that optimal may not be the most optimal. E.g. your model might suggest half mile stop frequencies. Seems good, until the public comment period and all the old folks who take the line show up and ask their particular stop not be displaced.

There is a reason why a lot of american bus networks basically follow the same old streetcar routes that were always there. People become used to existing patterns and build lives around them. New transit is a good opportunity to apply this model, but reworking old transit is tricky because some of your existing ridership will end up with a worse offering by definition, and they will protest. While the people who might benefit will not show up with equivocal advocacy in the public comment meeting.

The bus stop spacing problem is very real. Buses stop every other block in my area. The average speed end to end is no faster than riding a bike! If you suggest deleting some stops people scream about their own convenience or pretend to care about the disabled. By trying to cater to every single constituency, we've designed a bus route that serves no one's interest. A slow bus might not exist at all. People will just buy a car, going into high interest debt if need be.