Easy to miss points when the "point"" is full of nonsense. God forbid Rpg's evolve at all. Every other other genre in gaming does but RPGs? Nope, better not change my RPGs, get off my lawn god damnedkids!!!
There is nothing at all wrong with new and different games; it's the life blood of the industry. What's wrong is the shameless recycling of the of names that have an established reputation, and not delivering on that reputation. It is [rightly] called "Bait & Switch". The problem is not that Bethesda used the Fallout setting for their new games, it is that they used the eponymous series for them, and appended the #3 and #4 ~when their titles do not measure up, and do not even compete in the same arena ~or even try to; they don't want to, that's why they changed it to be a TES reskin ~that's what they do... That's ALL they do.
Everyone who lauds FO3 & FO4 as a Fallout title; and as an improvement... is essentially doing similar to lauding a thing like a brand of 'Orange Juice' as improved being orange juice [in their opinion] ~merely because they like it, it's orange, and despite it not having an oranges in it.
(And more accurately; the one expressing the opinion likely might have never seen an orange, and/ or be allergic to oranges.)