I wanted to post this for some time, but i end up forgetting.
I saw this link that Miyamotoo posted regarding carts for Switch (posted because of price issues? can't say, now): https://www.resetera.com/threads/are-carts-hindering-switch-reach-in-the-same-way-it-did-with-n64.36840/page-5
I think the thread is probably focusing a little too much on cart sizes issues.
If those insiders are to be trusted (have heard about one or two of them for quite some time), there's also another important issue that hasn't been adressed:
A few quotes by NateDrake:
"Power is on the lower end of concerns from third parties. Game cart size capacity is a far bigger issue that needs to be solved for third party support, as are software sale performance."
"32GB carts are available now but are extremely expensive. 64GB carts next yr will help a bit but, again, are expensive. Software sales are a mixed bag."
"I can say it is on the lower end of concern, because cart size and software sales are bigger issues right now. Games have been cancelled for Switch due to the limitations and cost of carts. Other games have been shelved because software sales."
In regards to the OP, sales seem to have not completely pleased 3rd party makers.
If this means western or japanese makers, or both, i didn't see anything that clarifies this, but someone isn't exactly happy.
