"Appeasement" is a term often abused, thrown about by commentators who seem to have no idea what it actually means. Appeasement and diplomacy are certainly not the same thing ...
Are you aware of the word's meaning?
Just in case, "appeasement" is the policy or act of granting concessions to demonstrated or potential enemies in order to maintain peace. To paraphrase Ben Franklin, "Those who sacrifice liberty for security deserve neither."
-- and given that the Federation kept sending its most powerful ship, the Enterprise-D, to confront the Romulan incursions beyond the Neutral Zone in early TNG, I think it's safe to say that the simple fact that the Federation made a concession to refrain from using their own cloaking devices, does not constitute appeasement.
Incorrect. When Chamberlin appeased Germany on specific points the royal navy still patroled the ocean to protect shipping lanes and he still ramped up military production, therefore, I respectfully submit your trying to somehow paint "diplomacy" and "appeasement" as somehow being mutually exclusive terms is wrong.
IOW, just because the Enterprise-D continued to patrol and confront when warranted does not mean there were no acts of appeasement by the Federation in their dealings with the Romulans, Klingons, whoever.
Also, when folks repetatively try to slap others with labels such as "warmonger" (or similiar) they only serve to highlight even more the flaws in their own arguments.