I've had a Fairphone 4 for just under a year running CalyxOS, and I am very happy with it. Not sure when / if CalyxOS will be available for FP5, but unless they have locked down anything, I don't see why that shouldn't happen. If I understand your post correctly, it is already available with e/OS/?

Maybe the specs are underwhelming, but with the FP4, it does not affect me the slightest based on my use case. Phones are more than good enough already. I do not play any games on my phone. Camera could be better - maybe it is on FP5? Is it the perfect phone? Nope, but at the moment, I think our choices are too limited if you want privacy and repairability. Supporting a company that pushes these kinds of phone is also a reason I went with this phone.

Swapable batteries are nice - I've not made use of it yet, but I am planning on getting one or two spare batteries for travel to keep in a printed case. In the EU, this will be mandatory in the future, but first form 2027. Other than that, I am happy with the ability to buy spare parts if something breaks. I can't see myself ever buying something that is deliberately unrepairable again when there is no reason it should be. I don't mind the lack of 3.5mm-port, which I know irritates a lot of people. If you swear to this, I can understand that this is disappointing. There exists an adapter, but my experience with these kind of adapters is that they quickly wear out. That was my experience with the iPhone and Apple's own adapters at least. I burned through four in 1-2 years.