clearstream
(He, Him)
That's an effective way to put your position, albeit making a great deal out of what might be more accurately described - in context - as a definition of roleplaying for the purposes of 5th edition.In order for the results of an ability check to override the player’s authority over their character’s decisions, an ability check must first actually be made. Since the criteria for when to make an ability check is that the outcome of the action is uncertain, the DM does not have the support of the rules in calling for an ability check to resolve an action with an outcome that is not uncertain. Since a player decides their character’s actions, an action taken with the goal of forcing the character to make a particular decision is certain to fail. Therefore the DM is not supported in calling for an ability check to resolve that action.
Roleplaying is one aspect of a social interaction. Ability checks is another aspect. Both are equal (both primary.)Social interactions have two primary aspects: roleplaying and ability checks.
When I am not determining how my character thinks, acts, and talks, I am not roleplaying. Hence we join in a roleplaying game. The tension between concession of authority to rules, and deeply valuing roleplaying, is a long-standing one. I need not always be roleplaying, or always be roleplaying to its fullest extent, while playing. Indeed, there are many circumstances where I need to selectively suspend roleplaying or incorporate mechanical facts into it.Roleplaying
Roleplaying is, literally, the act of playing out a role. In this case, it’s you as a player determining how your character thinks, acts, and talks.
Roleplaying is a part of every aspect of the game, and it comes to the fore during social interactions. Your character’s quirks, mannerisms, and personality influence how interactions resolve.
When a DM rules that the outcome of a social interaction with a PC is uncertain, they are suspending roleplaying. Baseline D&D entrusts DMs with significant power, and suspending roleplaying isn't an all or nothing proposition. A DM can suspend roleplaying in a limited way, or along specific dimensions. They must do so, for the game to operate as a game. Many examples have already been given.In addition to roleplaying, ability checks are key in determining the outcome of an interaction.
If a DM decides that in a given case they wish to suspend roleplaying in whole or part, they can deem the outcome of social interaction with a PC uncertain. Not only does nothing prevent that, but a DM must do it almost incessantly for the game to operate as a game. It's worth re-emphasising that it is not all or nothing. A silence spell might suspend a PCs ability to talk: they can continue roleplaying along all other dimensions.
A counter-argument could be to point to "roleplaying is part of every aspect of the game". It is grasping roleplaying as all or nothing that might give that the appearance of that being problematic. Roleplaying is not given primacy over ability checks - both are primary - and roleplaying is something that can "come to the fore" implying that it can also subside to the background. It is multi-faceted: not just one thing.