Hello, Uphill sections are marked on the new signs (except for Heiderscheid-Heiderscheidergrund🫣😓). I admid it could be clearer, but we are in Oesling, there are no easy paths. In Germany, there are a lot of really challenging regionnal cycle routes signed the same way as here in Luxembourg.
PC7 will be improved in the following years to be more direct and a bit less hilly. But I agree, it's really hard today when you don't have an E-Bike