I have asked the same question, and apparently they have ignored your question too.
This is really embarrassing for Magento.
I realize that Bundles are supposed to be used for something different - when the customer wants to build a product.
And they have “Grouped” products for a similar use - customer can define quantities, etc.
But ther eisn’t a single option for the *store owner* to combine SKU’s into one product, and have it display as one product on the store.
This is the biggest oversight in store software I could possibly imagine.
The two methods above are fairly rare with online stores. But *every* store I know creates combined SKU’s to sell as a “Bundle”, and wants them to display as a single line item.