Islamic finance goes back way before the present day manifestation. Many "Islamic finance providers" aren't Islamic FYI. So when reading a wikipedia article or any other source, that must be taken into consideration. For example, the "fixed markup" financing has been heavily criticized by Islamic scholars as basically nothing but interest. We definitely need better financing models.

Yes, prohibiting interest is a seismic shift, but at the end of the day, it's going to be better off for everyone. Islam lays outside the capital-communist spectrum, and is basically the best of all worlds.