IMHO, you are both making true statements.
Yes, per
@unpluggged, everything was always there — and still is! — through the front panel. At least, for those who will invest the time and are adept at manipulating the panel and remembering the sequences. And for those people, the remote control adds nothing new they couldn't easily do before.
But, the front panel is a barrier to entry for others. Such as myself. People who are not going to invest learning the sequences. And then go back and pull out the manual to re-learn the sequences all over again every few months (or years) when we want to make a change using the small LCD. Could I do it? Absolutely!!! Did I every do it? Never, not even a single time!!!
So at least for me, it is not unreasonable to say that the remote control introduced and revealed features that previously had been "secret"
to me. It is much easier for me to manipulate the controls... therefore for the first time, I am now manipulating the controls. And it is much easier for me to experiment with EQ settings... therefore for the first time, I am experimenting with EQ and Loudness configurations. Because doing so is now within the threshold of time and attention I'm willing and able to dedicated to it.