Making complex things simple can be very time consuming. While they are ensuring that the phone can do basic phone functions when it ships, it will become more complete later on. If Purism can afford to focus on techie people for the first batch, then they should for the sake of not overwhelming customer service and disappointing people who do not know what valid expectations are because they do not know what they are buying. I expect that Purism’s vision is to target non-techies, but do not expect everything in the first release. Vision implies progressing to a goal, and that does not imply getting there in the first release.
Your post demands that people spend time making complex things simple. Much of this work has been done in other topics. Forum etiquette involves finding where this work has already been performed, if not, find a recent topic where this discussion already exists, if not, then create a new topic. Skipping this sequence can be perceived as rude. Maybe you spent half an hour looking. But your first question is covered in the FAQ (required reading before posting here), and your second question is either answered in the carrier compatibility thread that is only 22 rows down in the Phones section of this forum, or that is where you should have asked. I expect that many users perceive that you breached this forum’s etiquette, and putting “you need to” in this conversation’s title makes it seems like you are entitled to breaking etiquette. “Not to be rude” was an expression to avoid sounding like they were scolding you. I suppose that there are other ways of reminding people of our rules, but that seemed like one of the more polite ones considering the specifics of this case. This conversation will go a lot better if you read the Forum RULES - please read before posting post. Purism’s official rules requires that you seek out existing questions. This conversation should continue under those topics that @Jt02h helpfully linked to. The forum rules also require that you check the FAQ, which happens to address your first question:
Will communicating from my Librem 5 to other phones compromise my privacy or security?
The Librem 5 will be the most secure when communicating with another Librem 5 phone, communicating via an encrypted app on a Librem 5 to an Android or iOS encrypted app is the second best option available.
This is a good non-techie answer. Going into more details will go outside of the proficiency of non-techies.