I would be happy if PureOS worked at all for web development.
After a few months so many tools stop working (if they ever worked in the first place) that I give up and move to another OS. See this thread for details: Long Term use of PureOS where I ask how many people are using PureOS long term?
My gut says the answer to the OP is “if you only want to use PureOS tools for developing only open source web applications that you will run on your own systems without any 3rd party platforms or tools then PureOS might work for you.”