Limitations I can think of off the top of my head:
• no public transport routing yet • no on-boarding guide (click and/or drag to set start location) • no waterways • treats all roads as if you can instantly accelerate to legal limit • no traffic/lights awareness • doesn't yet allow you to specifiy walking speed, cycling speed • export has some bugs, though it does work
(I've taken a pause on all coding projects for a bit, want to enjoy the weather while it's good, and also do more job hunting, more German lessons).