Again, since I do not have access to the case at hand, and I don’t feel like driving out to the law library, and, since I know (mostly) my UCC, legal tender does not have the meaning you think it to mean.
“Legal tender” in this case, particularly well read with the law you cited, is construed that it CAN be legally offered in exchange for goods, service, and debt. Note, you say MUST be accepted.
To see what really is going on, you must understand the complexities of “offer and acceptance.” I’m not going to get into it, b/c it will just open a huge can of worms, and I don’t want to hijack this thread. I will simply state that the Merchant is offering his goods for sale, and the Buyer is offering tender (or tendering an offer) to buy those goods. Implicit within the transaction is that the medium to which this transaction will be carried out is via cold, hard cash. But, that is not necessarily so. A buyer can be explicit about his offer and condition his offer that payment must be in bearer bonds only, for example.
A debt is similar, but it has an additional nuance to it, in that there is a bit more negotiation between the parties going on, even if it is implicit. Again, I don’t want to delve too much into this, because I don’t want to hijack this thread. Anyway, here is a direct quote from the case “all United States money as identified above are a valid and legal offer of payment for debts when tendered to a creditor. There is, however, no Federal law mandating that a person or organization must accept currency or coins as for payment for goods and/or services.” (emphasis mine). If you want to take issue with this, find something to the contrary.
You are reading into the cited law a means of transaction/procedure between the two parties wishing to exchange goods and services that just isn’t there. Do you really think lawmakers write the law so that they can needle their way into every component of one’s life? Some people would like it that way, but it’s far more efficient to let people contract their own transactions.
Good day, sir.