Thanks everybody for your very helpful replies. Cédric, allow me to explain
how I understand Parties versus Addresses:
If I have one big company as a customer, and this company is one party,
then I will invariably end up with several contacts within that parts (=
big company) with their related telephone numbers and other contact
mechanisms.
Admittedly, this expands the role of the address-only idea, but it is
undoubtedly useful. I think this is what raimonesteve and jmartin tried to
refer to. Of course, I could also shift perspective, and link several
parties to a super-party, where the party represents the company contact,
and the superparty the company.
The open question is what is the most user-friendly approach.
In any case, "Merci beaucoup!" and "¡Muchas gracias!"; I will try to
modules provided by Tryton Spain and Zigzag Media, and will report back.
Bests, Chris