If your product doesn't have a market then it's not going to sell. Understanding what that market is and understanding what they want from your brand and products is key, and you will only know that by talking to them. Don't do that and you will not shift the product.
Project Cars had an audience, a rather passionate and dedicated one, one that was quite clear in what they were looking fro in the next title in the series. SMS did exactly what you recommended, they went away and developed PCars 3 in isolation from that audience, making key design choices (and locking them in) without questioning how the audience it already had would react to those changes or communicating those changes with them. They then deliberately mislead that audience when they announced PCars 3, ignoring any and all concerns around the change in approach (and outright censoring a lot of that from the official channels).
The end results? The lowest selling and worst received release in the PCars series!
What your arguing for is the approach you take to an art-house film release, not one for a product you want to be commercially successful!
Do you actually believe that successful product design comes from ignoring your market and audience? It's absolutely 100% essential to understand your market and audience, to the degree that you can offer them what they need and want, but to also allow you to go beyond that and offer them what they don't know they need yet.
SMS wanted to make a more casual approach to sim racing, and they could have achieved that had the actually engaged with the audience in the right way, and been far more up front and honest about what they were doing. Hell they could have potentially managed to hit both the hardcore sim audience and the more casual audience if they hadn't thrown away what a good share of the former look for in a title, and instead made them switchable options. Instead they developed the title in isolation, promised the world to everyone and ended up with a product that was unappealing to a good share of the audience they already had, and was fair to mixed in its messaging to appeal to a new audience.
- The existing audience felt mislead and ignored and voted to a large degree with there wallets.
- The potential new audience they wanted to capture saw a product that appeared to simply be a continuation of the PCars series and saw no reason to leave the like of GT or FM for it.