I'm sure it is a disappointment, but I'd like to understand why does ESA need to repeat all the mistakes NASA has been making since two viking lander successes

I'm sure it is a disappointment, but I'd like to understand why does ESA need to repeat all the mistakes NASA has been making since two viking lander successes in the 70's. Mars is very hostile to landers and it seems wasteful not to use what was already learned and do something new.