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I can see both sides of this. I really want different part numbers for the same reason you do.

However we deal with a lot of regulated products and to just open a case at one of the Government Paper-Pusher Regulators will cost us $5,000 to just change the part number. We are a small company and $5k hurts.

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I'm sure it does and you have my sympathies, but your situation would not be a reason to let Texas freakin' Instruments off the hook. They're not exactly "a small company", and I wouldn't be surprised if the $5k would have been cheaper than dealing with the response to this, so this just comes across as incompetence on their end.

... How do the "paper-pusher regulators" feel about getting a completely different part unannounced? I would guess unhappy, tbh. Like based on the thread it's not trivial changes.

Kind of like keeping a certain plane model number the same, and claiming that re-training isn't needed even when it clearly is

An iPhone 17 is very different to an iPhone 3G, but we can pretend to ignore the fact one had its first flight in 1968 and the other in 2016.

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