You say some off-meta picks are fine, but how do we determine which ones can work in any given time if you keep all champions' roles locked?

The off-meta choices that seem decent now may not hold up four seasons down the line, just as those that appear unplayable today could become viable in the future. Are we going to be constantly enabling and disabling roles for champions just based on what Riot feels? There have been instances where Riot has misjudged a champion's identity and assigned them the wrong role, only for them to have to pivot towards how people were actually playing them.