I already pointed to the fact that sellers don't care to get paid right away or days later as long as they know they are guaranteed they get paid. And they are guaranteed by credit card merchants as long as their sold product is not faulty or as long as they did not overcharge or otherwise behaved fraudulently.
Edit: saw you edited your post. No, sellers don't need to get paid right away. Consider Amazon. They are in this for the long run. They could not care more whether they get paid right now or a week or month later. In fact it does not affect their reporting and accounting whatsoever. Sold and shipped product in a period are accounted for in that period regardless of when the money settles. Smaller vendors came more for cash management purposes but we are talking days not weeks or months. Even the family owned inflatable boat business I purchased from did not care whether they receive the funds right away or days later as long as they have the assurance that I made payment by the time they ship. They have that assurance from their fiat payment processor
Edit: saw you edited your post. No, sellers don't need to get paid right away. Consider Amazon. They are in this for the long run. They could not care more whether they get paid right now or a week or month later. In fact it does not affect their reporting and accounting whatsoever. Sold and shipped product in a period are accounted for in that period regardless of when the money settles. Smaller vendors came more for cash management purposes but we are talking days not weeks or months. Even the family owned inflatable boat business I purchased from did not care whether they receive the funds right away or days later as long as they have the assurance that I made payment by the time they ship. They have that assurance from their fiat payment processor
Who cares? I'll tell you who cares. The person or business selling the goods or services! That's who! You can't just look at the situation from the perspective of one party in a two-party transaction.