You clearly know nothing about the Russians. The Russians have changed a lot of what they were given by the Greeks.
You clearly don't know me, Russians, or Greeks. I know me, I know Slavs, and I know Greeks. References available upon request.
Instead of "knowing" Russians and Greeks, why don't you actually research and learn what the Russians have changed rather than asking the people? Of course, same applies to Greece, instead of asking Greeks what differs, do research and learn what things they changed.
I knew a hardcore Old Calendarist in Greece, and even he didn't know chairs were a very recent innovation in Greece. Just talking to the people of churches isn't enough.
That's what's so stupid about a lot of Orthodoxy. People automatically assume something is "apostolic" or traditional because that is what they are taught instead of actually doing research and learning the truth. I've heard people say that something is "apostolic" when we know that thing is no older than 200 years. It's ridiculous.
THAT is one thing I admire about Archbishop Lazar Puhalo and some of the people on YouTube that watch him. He isn't opposed to actual scholarship and isn't opposed to rejecting traditions that aren't reflective of reality. If a tradition says Saint So-And-So wrote Such hymn, but we know the hymn never appears in books until four centuries later, then we know that tradition is probably incorrect. Yet people will stubbornly adhere to such a incorrect tradition because they think the Holy Spirit inspired it and it must be true.