but is it taking care of Florin development? You can Fork Gulden yourself also. It's open source. Next to that, Florin had an own premine for development and in the statement Rijk put on slack it says that even though the premine is sold, budget for development is guaranteerd. So what you say makes no sense. Florin can pull its own weight simply.
What about development time, same developers working on two projects. The Gulden dev reward does not stop paying out while work is done on Florin? Florin can stand on its own but uses the same developers and community?
Florin is the reason Gulden was able to get the max supply reduced from 1.68 billion to 700 million and a halving every 4 years. The community saw the changes to florin from 10 billion to 210 00 with lowering the rewards and to make it fair the community asked for the same changes.