There seems to be a wide gap in the players of Town of Salem -- those that believe VFR works for town, and those that don't. Personally, I have come to think that VFR is absolutely effective in role lists with limited claim space. This includes most Custom, Ranked, and especially Classic. Basically, the smaller the claim space, the more effective VFR is. It does pretty much nothing for town in All Any.
How have I reached this conclusion? Well we can take VFR and claim spaces to their extremes and see what happens. Suppose there was a Role List where every single role was unique and different (I know there aren't that many unique roles, but let's just suppose for a moment). Now, the total opposite of VFR would be complete silence in the chat and only writing in your will. This would obviously let evils win by picking off town one by one. As we transition from one extreme to the other, we get silence except for major investigations like Sheriff finding Mafia. And always, what is the first thing asked in response? What are the claims for both sides, naturally. This is because the only way to resolve disputes effectively is to ask for roles. Now, when we get to the other extreme, the ultra-VFR match. Every day lasts indefinitely and everyone claims openly and shares every result they make. What does this accomplish? It puts every dispute in a category. If there are 5 evils, there will only be 5 disputes possible if the evils spread out their counter-claims perfectly. That means that however many roles are left are confirmed town and every result they announce is entirely true. And then all focus can be put on resolving these 5 disputes with the help of the confirmed town members. If there is a single mislynch, it is known immediately who to jail/shoot/lynch the next day. At the same time, it makes any single error in an evil will immediately lynchable.
But EgyptFalcon, you might say, doesn't that let the mafia know who to kill and who to keep alive? Yes, it does. But that benefit for the mafia is insignificant in comparison to the fact that town can coordinate openly, target investigations correctly, and put pressure on mafia to keep perfectly accurate wills. Now there exists some line between Classic and All Any where VFR no longer becomes a useful strategy. I would say it is much closer to the All Any amount of claim space than it is to Classic. VFR is still very effective in putting disputes into categories in Ranked.
Think about it this way -- if you are mafia, would you rather a day last 30 seconds or 10 minutes? If it doesn't really matter, then VFR isn't that great of a strategy. But if it is in mafia's best interests to bog down the conversation and inhibit the discussion, then VFR is a good strategy for town.