Prisma is being retired recalled, I wouldn't include that. SP20s and S4s may be EOL'ed in the near future [speculation and speculation].
I should say that I don't own any of the machines I mentioned..
From from what I read the old Prisma's have been recalled yes, but the new ones that they are selling have significant changes and work fine
As to products being near end of life, why does that matter they are available now. I could have added several more to the list I was merely illustrating that everything else is cheaper and the avalon has no advantages that make it worth more.
If avalon had a long standing history of delivering excellent machines at good prices with first class support then maybe you could argue that would be worth a little extra (as happens with spondoolies). Sadly the old avalon was rubbish and cost lots of people money, and the new avalon haven't delivered anything worth buying by normal consumers as it's arrived later than all it's competitors and always been more expensive.