Intentionally not mentioning the fact that these games were all improved soon after launch, are we?
Also, all of the above had an actual roadmap. Communication. PR. Also nonexistent for GT7.
We are six months into this mess.
Are you going for the world record in the 100m goalpost sprint?
All of which is irrelevant to proving the following statement wrong.
This thing is a desaster and companies dont invest any more resources into something that is dead on arrival.
Companies
do invest resources into games that were dead on arrival. As you noted, they do so by doing things that Polyphony and Gran Turismo have mostly chosen not to do. Although shortly after launch there was in fact both communication and a rudimentary roadmap.
As far as "soon after launch", let's have a look at Final Fantasy XIV - my favourite example of a trash fire of a game that turned itself around. The 1.0 version was released September 2010, and was pretty much immediately panned. That version of the game kept going until November 2012, and while improvements were made it was a garbage game right up until the servers were shut down. After that the alpha servers for 2.0/ARR came up, but the "fixed" version of the game wouldn't release until August 2013. 2.0 was okay, but it was basically just a WoW knockoff with Final Fantasy flavour. It wasn't until the expansions (Heavensward released June 2015 and is the first part of the game that was considered truly exceptional) that the game would really start to take off, to the point where in 2022 it's probably the best current MMORPG.
That's nearly three years to get from initial release to a game that was not hot garbage. And five years to get to being a real competitor with the leaders of the genre. In nobody's world is that "soon after launch".
Now, I don't think Polyphony are doing what Squeenix did, for a bunch of reasons. But you seem intent on making false statements to "prove" something that is pretty evident to anyone watching the game - that Polyphony is not terribly invested in making any major changes or improvements to the game. That's just Polyphony being Polyphony.
Just update your signature. Don't be shy, be proud of your verisimilitudinal disability.