Business partners are only worth it if they have something of enormous value to offer your business, like skills, knowledge or connections. Getting a business partner just for the sake of not having to do everything by yourself is not a good idea.
Personally I would avoid partnerships that are not absolutely necessary and can be substituted in other ways.
You are right, in choosing a business partner it should not be done to split responsibilities or to find someone to work with, but rather a person that will contribute a lot to the business. While the partners who can provide specific skills, knowledge or connections may be highly valuable, partnerships that do not offer high value may be quite unprofitable and therefore dangerous at the best. Concentrate on those opportunities which are really necessary as this approach will further guarantee that all the strategic partnerships must bring positive results and can perform better.