Whilst i agree with your sentiment, particularly this post, i do actually feel the added tire barriers are a step in the right direction.
Sure, there is going to be some pain and chaos for a while as people go barrelling into corners at speeds they’d normally take it, only to find out there’s a barrier and they’ll now need to run the course properly.
However once the dust has settled i think it will actually lower the issues at these spots as people will be less game in attempting an overly ambitious or agressive move which 95% of the time saw them gain a postion and someone else severely impacted - now both people will be severely impacted.
In a perfect world only the culprit would be impacted but this is Forza, a system like that isn’t going to come into play as it has so many knock-on effects and changes to gameplay that it will be offputting to many unexperienced and casual racers - which are not one in the same - and to that effect is something that shouldn’t be lost sight of. I like that Forza is highly accessible to a wide spectrum of people and that i can have enjoyable competitive races with an unexperienced teen who doesn’t even have a license, a casual retiree still learning about the interwebs or a hardcore racer who lives n breathes anything with octane fumes (sometimes all at the same time). There’s many people who wouldn’t have gotten into racing had it not been for Forza and some of them even shape up to be a top racers - no one comes out of the womb with a racing helmet and firesuit on afterall, except maybe the stig 
What i think everyone pretty much unanimously agrees on is something needs to change as public hoppers are absolutely awful whether your casual or hardcore and online player numbers are getting to worrying low levels. So it’s good to see some changes in an attempt to improve the environment over nothing at all - even if not everyones likes the changes as you cant please everyone.
Where i think T10 are really going wrong and should focus on changing is forcing both casual and hardcore racers together with no other choice - they need to cater for both but should allow the player to choose which style they feel like on any given day as the one-size-fits all really aint working.
One significant difference that comes to mind from FM5 to FM6, there used to be a full line-up of “beggining racing” lobbies and “regular racing” lobbies which had noticeably different racing despite being very similar other than track line-up plus lap count. It may not be a silverbullet nor seem like much but it went a long way to keeping people that just wanted to muck about for a little while or still learning separated from the people who actually wanted some serious racing - i for one would race in either depending upon which suited my energy and intoxication levels at the time.
It was also beneficial both ways, the inexperienced/casual audience wouldn’t get whipped every race nor risk a verbal or physical bashing if they hit someone by accident (cause this is becoming a problem too, intolerance by hardcore racers who get overly aggressive) and the hardcore/serious audience wouldn’t get wrecked on every second corner nor stuck behind someone then slammed into upon a clean pass. Obviously it didn’t eliminate these situations entirely but it drastically lowered the occurance of them - i cannot recall the last time i’ve been in a hopper in FM6 and after just a couple races haven’t witnessed at least one of these which says it all really.
Now if only they’d change tracks like bugatti and yas so they weren’t such a corner-cutter fest…