That's all of them that are exceedingly dump then.

Using fuzzy heuristics to determine routability between ways will not work as well as you appear to think it will - making it able to "jump" between apparently unrelated ways would require mappers to go back through the whole of OSM putting in explicit barriers (walls etc.) where we don't want this to be possible. Not going to happen.

There is no information you have conveyed to the OSM data model that could let it know that it's possible to traverse from that footway to Ashmole Street directly. Unless you're about to rewrite the last 20 years of routing technology for us around vague proximity of ways to each other denoting traversability, in OSM we have to work to the "limitations" of what we currently have, and adding sidewalks in the fashion is going to lead to weird routing results for users without really adding much of any use.

The problem with doing separate ways for sidewalks is it screws up routing: https://gist.github.com/risicle/c523638c7768b1c3292e8c7b07aa7563

Are you sure Cobbets Farm isn't actually spelt with two "t"s, as in OS Locator? https://ris.dev.openstreetmap.org/oslmusicalchairs/map?osl_id=189443