Hardened summer tires bad for the chassis or can they burst?

Hi, I looked at my summer tires today – it’s Michelin Energy, 205/55 R16, now eight years old and still have about 3 mm profile. They were dangers by myself on my Golf V TDI. From the profile I would put them on again (do not drive much at the moment), but: I noticed last year that the tires feel pretty hard. Does (except in the case of rain) a higher risk of a tyre placer or of consequential damage to suspension and suspension exist? for a few expert opinions very grateful. If you are a car driver, please write, then you can better assess the opinion. Thanks already!