I haven't driven a Plus Four yet. I don't know if the original suspension would be enough for me. However, I have done a lot of fine-tuning so that I really like the suspension of my 4/4. It was rather the other way around with the later 4/4s, which were much too soft and bottomed out. I don't want to compare apples and oranges.
But I am surprised that a relatively expensive car like a Plus Four doesn't get decent suspension from the outset. Sorry, with any other brand, this is seen as a core element of driving pleasure. Of course, there are people who tinker with every car of every brand, but often unnecessarily. Imagine a Porsche or even an MX5 with such unpleasant suspension that the owner has to find an expensive remedy immediately. In my opinion, MMC is saving in the wrong place with the Plus Four when it seems that so many of you are looking for an improvement.