You are misunderstanding this situation: VoLTE is enabled by default and that the VoLTE setting is not stored at the OS level so users don’t need to reconfigure it every time.
It does seem like you’re reading too much into this and claiming that people are here trying to show off. My responses are generally terse because I don’t care too much to share many of my opinions on things so I participate here to provide technical guidance and help because I care about fixing issues people are having.
Purism probably would like to add more GUIs for people’s convenience but it can be expensive to design and build graphical tools. It’s not that they aren’t doing that – we recently got the PureOS Upgrade tool while the manual upgrade method still exists. Designing and building these tools is a give-and-take tradeoff and I think Purism is focused on the upcoming Librem 16.
Thankfully Linux has been getting a lot of attention and things are only improving. Purism is not the only organization making things better and they should not be. I appreciate them making improvements in the areas they are able to but they cannot do it alone.
Change does not happen overnight and in the video I linked, their most recent try is a lot more successful from the incremental improvements even in the last ~4-5 years.
Edit: Obligatory GNU+Linux because some forum members will chastise anyone that does not say this 
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