I don't like the coalition thing that much and this is why:
People who voted for COPE as an example and COPE is part of the coalition, this means those people are happy with their vote and will still vote COPE again the following election. However if the DA runs the province and keep the whole province happy the people who voted for the other parties will vote for the DA again next election.
Once you have the Majority, you need to keep it and provide the things that will make a difference to the people there. That way you win more votes for the next election
Yes, if you need to get the majority. No if you have the majority.
I hope they think about it very clearly before taking on un-needed baggage.