For myriad reasons Blue can't just "scale up quickly" in any meaningful way from NS to New Glenn, hence why it's going to take them 8+ years between the first NS and first NG launches. Being realistic about this is not cynical and negative.
Certainly applies to the operational launches of all their rocket vehicles, however they've also done suborbital test flights with with Grasshopper, F9R, Starhopper, Starship (and maybe Super Heavy soon as well depending on if they do a sub-orbital with that first).
The important difference is that SpaceX has never considered the Karman line as a target in its own right (somewhat rightly, its only value is for "whelming" space tourism).
So you're saying that after say the initial 100 launches
Launch 100-199 would have 5 failures
Launch 200-299 would have 7 failures
Launch 300-399 would have 10 failures
Why?
Generally doing more of something reduces the cost per something. Why do you think the inverse will hold with spacex?
You need the demand to make that worthwhile though.
Especially since blue origin has a design that can scale up quickly, as SpaceX did with falcon 1 to 9