Thank you for the workaround suggestion.
However, that approach is not practical in this case. I’ll have to reduce the setting each time I want to edit the post.
Typically, admins post threads with concise titles for important posts, similar to the “Terms of Service” (just an example, I’m aware there is a seperate page for that) or similar topics that require occasional updates. Having a lengthy title like “TOS terms of conditions I wrote this long tittle because I have no control over my own site” would indeed appear unprofessional. It would be more ideal for admins to have basic control to create a thread with a shorter and more concise title, such as simply “TOS.”
C’mon, what’s the use of being an admin if the admin also has to abide by the basic rules? 
Having control over most things is a basic necessity for an admin.
If I want to request this to be made available and added to the settings of official Discourse, which category should I post it in? Would it be the ‘feature’ request category?