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Ifixit gives fairphone 5 a 10/10 on repairability and maintanence
(www.ifixit.com)
This is a most excellent place for technology news and articles.
Very few people are plugging their large headphones into their phones though. For a more reasonable pair of portable headphones or IEMs the size of the plug isn't a problem.
But congratulations, you have hit on my biggest audio pet peeve! DACs matter very little these days. Anything talking about DACs and not the DAC/Amp stages is marketing BS. Even dirt cheap DAC chips will acoustically transparently convert the digital signal to analog in audio frequencies because it is so basic to do. DACs on their own are useless for audio anyway, what really matters in your audio signal is the amp circuitry after the DAC that applies gain to the signal to useful levels as the choices there do make an acoustic difference if the design is poor.
What makes you think the DAC/Amp in your headphones is going to be better than the one that is built into the SoC of your phone? I don't think I've ever seen any measurements of headphone DAC/Amps.
I learned that from my father, who mostly listen to music from his phone using external headphone amp for his bayer dynamics studio headphones, or uses digital out (via Bluetooth) and let his other Bayern dynamics active headphones do the DAC. He is sure that he hears the difference, but of course that could all be in his head alone. I myself am not a hiFi enthusiast, I only find the tech behind it very interesting. (I listen to music using airPods and in my car using CarPlay, sorry iPhone user here, but thinking to migrate as soon as my iPhone X becomes unusable) But given my interest in tech, I appreciate the explanation, that cheap DAC chips are very good as well, these days.