Sprint is an experimental stage application with issues that is undergoing rapid development and attempting to accommodate the needs of a variety of uses. A regular testing, review and deployment plan should be implemented to facilitate the continuous integration of Sprint with Phabricator main.
There is an important bug fix that has been sitting in Gerrit since 11 December with no action. (https://gerrit.wikimedia.org/r/#/c/179155/). A hotfix like this could and should have been handled promptly. If it is a question of concern about "making a bad situation worse", this is absolutely not the case with T78208. This is a very simple problem with an easy solution. Any reluctance to merge this change is not warranted. However, thorough code review is always appropriate.
Furthermore, Sprint is now at 0.6.1.9, and the additional patches will absolutely improve the user experience and address some of the key problems noted in the first go. When or if these changes will be merged is clearly not at the discretion of the developer, but with the maintainers of the production instance. I encourage those responsible to take this task to task.