Can someone tell me why this disclaimer? I can not figure out why reusing addresses might not be safe.

Moreover, if indeed it was not sure, I think there would be a design problem in the protocol.

Eg. it's hard to imagine a future in which my employer can pay me in bitcoin and I must tell him a new address for the salary every month!

Well, probably in an hypothetical future like this there will be the chance to set up a monthly automated payment request to my employer.

Do you think the disclaimer can be interpreted in this way?

Finally, services that are based on a payout address to redistribute any wealth generated how they should adapt?

Thanks ;-)