Well, if you ski 100 days per year for the 5-year life of a helmet, you will have skied 500 days and probably put the helmet on/off 2x per day, so that is 1000 helmet wear cycles.
For those 1000 helmet wear cycles, fit is the primary factor that mattered.
Then, you have 1 day where your head hits something and you need the helmet tech/protection. There's a good chance the hit does not need the MIPS function in order to help protect your head.
So that 1 helmet wear cycle, you might need the tech.
1000 : 1 ratio of fit vs tech need.
HOWEVER: if your skiing regularly consists of high-energy mishap-laden falls and collisions then I would go for the tech.
For those 1000 helmet wear cycles, fit is the primary factor that mattered.
Then, you have 1 day where your head hits something and you need the helmet tech/protection. There's a good chance the hit does not need the MIPS function in order to help protect your head.
So that 1 helmet wear cycle, you might need the tech.
1000 : 1 ratio of fit vs tech need.
HOWEVER: if your skiing regularly consists of high-energy mishap-laden falls and collisions then I would go for the tech.