I thought I mentioned it, but after re-reading, that bit seemingly got lost during editing. So yeah at launch a system seller often has a huge attach rate (remember BotW reaching over 100% attach rate?), and there simply seemingly ain't anything big enough that launch.
That being said, even then reaching over 30% attach rate is very difficult even at launch. I did take the launch into account, but that part went poof. Both Sony and Microsoft tend to lack a true system seller at launch and rather launch with lots of fancy third party titles and smaller exclusives. As a result of this, unless one of the third party launch titles is a huge hit (think FF7R, a Dragon Quest or Monster Hunter title, for example), they simply can't reach high enough to chart.
I have been tough on Sony but the fact that their system seller is a pack-in title also does them no favors in conversations like this one.
01000110 01101111 01110010 00100000 01001001 01111001 01101111 01101100 01100001 01101000 00100001 00100000 01000110 01101111 01110010 00100000 01000101 01110100 01100101 01110010 01101110 01101001 01110100 01111001 00100001 00100000