Agreed, a "true scale" IRS F1 car does not need to be complex like that 1/5 car that RedBull showed. It also wouldn't be anywhere near as expensive as the 1/5 cars which go from $1500 to over $2000. It would likely be in the $300-390 range, tops! Still less expensive than a high end 4wd touring car. Mantis has proven that a IRS F1 car can be simple and easy to tune.
Having said that, I am looking forward to the new 3 Racing IRS car; however I am disappointed that it has a plastic chassis. Hopefully 3 Racing will have a carbon fiber chassis available as an upgrade. Also, it's too bad that it won't except Tamiya F1 bodies, the best in the business.