You’re right that “recycling” of content isn’t new to the series but the problem is that it reached entirely new level with FH5. I’ve analysed this process by comparing post-launch cars in FH4 and FH5 in another thread some time ago, perhaps you’d be interested in taking a look (and we can continue discussion there if you wish 
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As for the new Nissan Z - I’m very happy to have this car in the game (especially as free content), it drives and sounds wonderfully. I’m sure visual customization parts will come later 
And it seems to have fully operational dashboard this time, unlike Lamborghini Sian 