Please understand and keep in mind, did use some of your questions as examples, however much of this post is intended to be generalizations not necessarily specific to you.
You do realize that this is the community forum where other customers are responding to you correct? I ask because some of your statements come across as if you are talking to a Purism representative when you are talking to other customers/potential customers.
No company tries to answer all potential questions on the main sales page. Yes they try to provide relevant information and many provide links to FAQs but there are limits to what is reasonable.
Also answering complex questions with simple answers only leads to disappointment (and often accusations of lying) because it’s making reasonable assumptions to simplify the answer.
For example: Will the Librem 5 work on Verizon? This could be answered with a simple “yes” HOWEVER this is merely a technical answer and assumes the customer can navigate any business hurdles with their Verizon rep. This also assumes that you don’t live in the small percentage of places that will only be accessible by the wireless bands not supported by the Librem 5 (side note: many certified devices sold by Verizon also do not have all of the bands Verizon uses so this is no different than every other phone, yet my experience tells me that if Purism just said yes they would be accused of lying about the support even though Samsung and others would not even be examined)
Can I use this phone with my existing plan? Could be answered with a simple “yes” however, that assumes that your carrier is willing to allow you to change phones on your plan, some carriers will grandfather in a customer letting them keep an old plan until they change phones. So again a blanket yes isn’t 100% accurate in all circumstances and the more accurate detailed answer just gets met with “I’m not a techie tell me yes or no” when the issue isn’t even technical but a business issue of will your carrier let you change phones without modifying your plan/contract that you are likely modifying by changing devices.
There is no non-technical answer on securing any technology, asking for a simplified answer to any related question just opens up all parties for disappointment as the person with the knowledge can’t possibly know every situation you will encounter and in turn will be giving an incomplete answer. In my opinion, the better approach is to provide guidance to the knowledge for those who seek it.
With that said, is there room for improvement, always for all parties involved. Yes the people at Purism can, and should, improve their individual communications. The customers, potential or otherwise, should also strive to improve how they communicate as well. This includes listening to understand, not just listening to respond.
Now I did use some of your questions as examples, however much of this post is intended to be generalizations not necessarily specific to you.