It may focus on user's rights, but it still requires technical expertise to exercise half of the 4 freedoms: #1 (inspection & modification) and #3 (distributing your modifications). Merely knowing to ask "can I see the source code" I would put into the "technical user" realm. Overwhelmingly, most people don't know or don't care.
The other two freedoms #0 (freedom to run) and #2 (freedom to share) are readily obvious to non-technical users. "Double click to run" and "drag and drop <on external drive> to copy". Unfortunately, they are also often permitted by non-free/libre software. So non-technical users that can readily see they can do #0 and #2 and generally have no litmus test to further determine whether the software is "free/libre".
This is a case where the ideology's practical concerns hamper its purity. I critique despite generally liking the FLOSS ideal, but it's important to know its flaws.
The users don't have to be technical to benefit from those freedoms though - there's a level of indirection involved. I might not have personally scrutinized every line of the Linux kernel, but knowing that there are tons of people in the world with the ability and motivation to do that inspires confidence.
I am not arguing that one has to be technical in order to benefit from those freedoms. I like FLOSS and agree users in general benefit.
I am saying that your example, for instance, stills falls under the "how does a non-technical user simply verify the software they just downloaded respects their freedoms?" which is an very real educational and cultural problem. For example, see the massive money and numerous gun ranges, gun stores, gun clubs, and other gun-associated organizations in the US that work to educate the "unskilled" general public on "how to be aware, recognize, and exercise their rights and freedoms" under the 2nd Amendment while respecting local laws. Folks generally are 1) aware they have the right and 2) have a low-friction no-special-technical-skilled path to exercising that right. The FLOSS movement is nowhere near that level of educating and making aware non-technical users of their freedoms, their digital rights, and how to then act upon them and exercise them. Folks generally are 1) unaware of libre software and 2) don't have a low-friction no-special-technical-skilled path to exercising that right.
The other two freedoms #0 (freedom to run) and #2 (freedom to share) are readily obvious to non-technical users. "Double click to run" and "drag and drop <on external drive> to copy". Unfortunately, they are also often permitted by non-free/libre software. So non-technical users that can readily see they can do #0 and #2 and generally have no litmus test to further determine whether the software is "free/libre".
This is a case where the ideology's practical concerns hamper its purity. I critique despite generally liking the FLOSS ideal, but it's important to know its flaws.