Ya can never have too many gears.
Nice bike - steel is real. To be fair, my old Pinarello had a six-speed rear and two up front. I (like you) always believed "that's plenty" until I got my new one (10-speed rear cassette). Man, what a difference. Granted you probably don't "need" the extra gears, but it gives you a better chance of finding one for a given grade/situation that will match your desired cadence/power output far more easily without forcing things or compromising.
I love old steel bikes, but I've gotten VERY used to an aluminum/carbon setup with modern geometry and lots of gears. There's a reason - there are really some great trends in bikes out there now.
Kind of like the difference between a 70s 911 and a 997. The 997 is far more refined but it doesn't mean the raw and visceral 911 is "bad". Just different.