Here I could read things like…“Potential for upgrades and expansion” or “we incorporated elements that enable upgrades and expansion without having to change the entire hardware.”…“all of the individual units can be replaced”. Wasn’t there a camera upgrade? So it doesn’t look like they have forgotten. But also they never stated wanting to upgrade each single module. Or did you mean new FP3 (bottom) modules would fit into the FP2?
So you ordered the phone some around 2018/19, that’s more than 24 months ago. I guess you do know about some trading and warranty laws as far as you as customer should keep awareness of. Even if you receive a spare part or your item is repaired your initial overall warranty period will not be extended.
That’s actually bad luck as BTLE (Bluetooth low energy) is based on Bluetooth 4.0 with different implementation levels up to 4.2. It wasn’t clearly stated in the technical specs of this audio column system which BT version it needs, so I assume it was an incompatibility issue that got in your way just as with e.g. many Corona apps that do not work properly on FP2 even with Android 9.
I’m glad to have a friendly neighbor who did not force me to purchase a device that knowingly would not meet my needs, it was my free will to buy it and I did well with my decision even after using it 5+ years.
“The biggest problem, in my opinion, is the software” - clearly no for my opinion! It’s the customer permanently comparing Fairphone with conventional manufacturers/phones simply neglecting the values behind Fairphone yet permanently asking for when their next product will hit the market. If one isn’t into the costly “Fair” game to get related things better, stay out of it and keep up with conventional phones as complaining doesn’t help anyone in the supply chain.
I assume in the past with your conventional phones you always had the latest Android version in use and security patches were only a month old. I’m curious which manufacturer beside Google itself kept their old phones up to date to the latest Android OS and regularly provided security patches each month even after 4 years. To be “fair” it does look like this game has changed in the recent past since Fairphone has entered the stage, but not long ago thing still were this way.
Nice, you got it how the “Fair” game works, unfortunately there are still too many who are not open or unable to follow although Fairphone is some about 8 years in the business already.
It sounds like you not only read the users manual but also did fully comprehend how to handle any mobile phone properly.
I don’t know where all these technical issues reported come from, but I meanwhile do believe having golden hands if it comes to technical items - they just run and run and run.
As I have mentioned above already - simply the wrong game here, this all here is about Fairphone not “unfair” devices.
…second/third/fourth… switching your neighbor could help keeping you off from being forced to permanently purchase new mobile phones filling up your drawer.
Oh, my bad - sorry I accidently assumed you were out for a community comment. Again wrong place here.
Alternatively it’s your free will (mind your neighbor though 
)to purchase any unfair device meeting your expectations as Fairphone is not yet playing in the top league.