I actually have no problem following a vegan diet myself (I find it really easy, track my nutrients and blood tests are fine after a long time), but I've researched plant nutrition and similar topics more than maybe the average person has (and before I did, I might not have been eating what I needed to, although it's possible I actually was anyway).
So this was more just wondering about ways to make it easier for the average person to go vegan, so that when advocating to people about veganism/animal rights/environmentalism/plant based diets, we can say "vegan diets are easy, you don't even have to think about what to eat, just eat plant-based foods and you'll be fine". If only that were true, but I think while it's quite possible a person could get enough nutrients on a plant based diet without thinking about it (I pretty much did until I started looking into it more), it's currently highly recommended for people to learn about which foods to ensure they're eating enough of, in order to prevent cases of people not eating properly and getting sick and then unfairly blaming plant-based diets as a whole, which sadly do happen.
Having more fortified foods and just nutritious plant based foods available in general, as well as promoting them for plant based nutrition, could make it easier for people who don't know much about plant based diets and haven't researched it. Another option, aside from learning about what kinds of plant based foods to eat, might be for people to take supplements if they're unsure about what to eat or while they're still researching about it. And for some people, supplements might be a good option anyway just to make it easier or depending on what they're eating, and what works for them.
I get all my nutrients from plant-based foods (including fortified foods), not because I have any problem at all with supplements/vitamins, but simply because it's actually easier for me to just incorporate different foods into my diet instead of taking supplements. For other people, supplements might be easier, and could be recommended if they don't know what to eat (though they could easily learn), or if they're unsure, or if it just works better for them.