What is the future of deprecated methods of PageManager, SpaceManager etc.?

While working on Confluence 9 compatibility, we noticed (again) that many methods like PageManager.getPage(long contentId) or SpaceManager.getSpace(String spaceKey) are deprecated (and have been for quite some time).

In many of our apps, we rely quite heavily on those methods (also from other, comparable Managers). The methods from services like ContentService.find are no real alternative for us, because, first, as far as we know, they take the permissions of the current user into account, and second, they return objects from the package com.atlassian.confluence.api.model that lack functionality.

We did not see any mention of this part of the API in any Confluence 10 announcement.
Can any official from Atlassian tell us if it safe to keep using those managers in the foreseeable future?