I noticed that they’re listed in the Actions menu, but (for me at least) this seems a less helpful place as to see them - especially so if there are a number of action groups - as seeing them involves many more keyboard presses or the use of the mouse. I agree that it makes sense that they are shown here. But don’t find it particularly helpful for my actions.
I guess that both the shortcuts being displayed in the menu and the tool-tip are great for reminders. But when one has a decent number of actions, remembering isn’t really a viable option, and reminders become less useful than clear labelling.
My use case would be that I can quickly toggle the Action list display (I would usually have it hidden) and then be able to quickly see what keyboard combination is needed to invoke the action I want. All without having to grab the mouse. I could (and have considered doing so) add the keyboard shortcut into the name, but this seems a kludge and wouldn’t look as good or as clear as it could if built in.
For me at least, the way it looks in the Manage Actions panel would be perfect - even if it’s optional.