It is a dirty city, housing is expensive and generally in a poor state, and there a lot of security issues and social unrest: burglaries, violent protests (almost every week), periodic riots in some suburbs and terrorist attacks. To the point that more and more in the media, you hear about an upcoming civil war. Add that all the famous France's plagues: strikes, bureaucracy, very high income taxes for people earning more than 2000/m Euros and more recently communities living more and more separately.
There is no social unrest in Germany, Frankfurt is much safer and Germany more reliable.
It is a solid 'upper middle' tier city, where everything is clean and neat.
It’s one of the downsides of Germany’s less centralized economy. While not the same status as London, Munich or Berlin would likely be more attractive destinations for their families.
What daily attractions does Paris have? Sure there is the Louvre but I didn't visit that as a tourist (no way I'm standing on these lines); so I don't think I'll be seeing it everyday to work.