Ichat,
I think the answer is within Zentyal's hands but this is how I see it:
If we were dealing only with open source without any commercial version, I share that priority would be technical choices first. If you don't need to sell your product but do it for fun only, you can focus on technical choice and have the best intellectual approach, even if your market is very small as it has not impact.
If, on the other hand, you provide community version but also standard and professional versions and need to sell service in order to survive, then you look at what market is made off and priority is not technical choices but solution that will permit to take market shares. And this market is, today, almost 90% Microsoft.
Look at
Zentyal home page Next webinar is "bye bye SBS..." jointly with Canonical and Zarafa.
This is why I said that, although I do not share the technical choice, I do understand why this is made this way and acknowledge this is perhaps the best short term solution.
Non-Windows clients are very few. And, look at this forum, even those targeting Linux only clients and servers are asking for Windows like features
I never saw one asking for NIS or NIS+ equivalent domain or anything similar to this (hopefully BTW
but some wondering how they could apply GPOs to their Ubuntu clients joining Samba (Windows) domain. Is there anyone asking for NFS instead of CIFS ? I don't think so...
So, this confirms that Zentyal strategy, at least for SMBs, is the right one, from marketing standpoint.
Medium to large organizations is a very different debate isn't it?