My two cents on this is that, both hkbus fandom and Wikipedia have their own policies, so it might not be the best idea to follow them indiscriminately here.

1. Schedule of Routes gives official definition so if (a) it is written as such and (b) the information still applies today, use it.

2. Some newer changes (e.g. Citybus 79P) need to refer to Transport Department notices.

3. hkbus fandom always splits routes, but they will often include a statement that a route is a special departure of another route, referring to the Schedule of Routes

4. Wikipedia group routes of similar function or historically related into one article.  If a route group doesn't have wikidata because of this, leave it blank.  The only exception ever I made was KMB 290A, where I simply put wikidata of KMB 290 onto it.