Earlier quoted context omitted.
Think of the average windows user. This person uses Chrome because they got a popup when they went to Gmail. The shortcut for candy crush is still in their start menu because it doesn't bother anything. I am not being insulting -- this is the average, median windows user. This is the person for whom Windows Home is designed. There is ZERO CHANCE that this user knows what a "speculative execution mitigation" is. There…
Yes, so Microsoft has to make the decision for them. I'm not sure "we're going to make your computer 30% slower because there's a 0.0001% chance someone could steal your password" is the right decision. (These numbers are completely made up. Any decision would depend on getting the right numbers, but this appears to be easier said than done. I've seen very different estimates.)
Let us say 20% and 25% * 1.5B. Maybe 75M targets give or take depending on how you want to do the math.