"Then how about this?"
For the majority the mantra will not change. It will still be "only the first two are good" because nuance only exists for people who care.
For people who rank the films? Probably something like this: Alien, Aliens, Romulus, maybe a mention of Isolation and or the Assembly Cut of Alien³ in discussions.
For myself? Probably Alien, Aliens, Alien³ and Romulus, but whereas Alien³ will probably have more style and look far better, Romulus will probably be more all round solid and or serviceable but not launch anyone into the stratosphere.
I hope I am not on the money, but I feel like I am, thus I remain more excited for Noah Hawley doing Alien... because it will undoubtedly be something new and not devoted to the prior mythology. Whether we ultimately love it or loathe it.