What they are trying to say is Steam gift cards might not be able to be activated by physical stores (e.g. convenience market) at some point in time. Physical stores might stop selling them even if they still have them. Almost any stores will run out of cards way before this happens.

Edit: Valve might still support activating them, but the stores software might drop support after a few years (or months, idk).

As you said: Once activated gift cards will likely be able to be activated for a few years, at the very least (legal requirement), likely longer.

Edit 2: Obviously there’s no real reason to care about this. If you need physical gift cards, buy them now.

Latency is compounding. There’s no point where less latency is not better. It’s completely irrelevant how fast my reaction time is, as removing 3ms from the system latency allows me to start reacting 3ms earlier.

Edit: I do agree though, that 3ms more or less is not a deal breaker. I’be been playing on Wayland for many years. But not being a deal breaker does not mean it’s not a big deal.