I know how you feel; I was in the same boat. I ended up going with System76 even though they’re less free than Purism (though the difference isn’t exacty huge) because they don’t have problems like this and because it filled my #1 priority, which was not buying from an OEM which would end up paying a Windows licensing fee to Microsoft. System76 is also now starting to port coreboot to some of their machines although that wasn’t the case when I purchased from them.
Of course it’s up to you if you think it’s still worth it and want to stay with Purism, and System76 certainly isn’t the most free company out there - in particular most (all?) of their desktop/laptop products include Nvidia GPUs, so you’re voting with your wallet there too in favor of a company that’s very hostile to free software drivers. But I wanted to give you something to think about and hopefully provide a different perspective 
Either way I would encourage you to give Purism that feedback directly. I personally find it unconscionable that they’re pouring so many resources into their phone project (which is a complete moonshot given how Firefox OS and Ubuntu Phone - both from organizations much larger than Purism - failed to put a dent in iOS and Android’s market share) and now even a suite of online services when they can’t (or won’t) even support their existing laptop customers, and I told them so in the very last email I sent to them.