I must be in the minority. When I’m playing in a band setting, I for one, can’t hear the difference between amp brands for the most part. Nor do I hear much of a difference between scale length of basses. I can hear the difference between Rotosounds and Chromes at lower volumes. But when you’re pushing it ,the difference diminishes. Rosewood and Maple boards? You’re joking, right?. Stock picks vs after market? Nope. These all might make a difference if you’re sitting in your bedroom , playing along at low volume to your favorite tunes but not in the real world. Not to me anyways.
As far as I'm concerned, this is accurate. I know for a fact that I don't hear a difference in sound quality between 34", 32" and 30" basses because I own examples of all of them. Of course, if every one is a different brand and model of bass, "no difference" means "other than the difference inherent in a different brand and model of bass."
You wouldn't expect my 34" '63 P to sound like my 32" hollowbody Gretsch 5123, and neither would sound like my 30" '64 Gibson EB-0 or my chambered 30" Gretsch Thunderjet. But I defy anyone to identify a difference in scale length based on the sound.
I can hear a difference between old flats of various types and new Chromes, but when the Chromes are 5+ years old, I really don't. I'm not a rounds player, and I don't change strings unless they break. I have put tapewound strings on one modified Gretsch short scale because even flats were too bright...but that was specific to that bass.
Rosewood vs. maple? Agreed. NO difference in sound.
Amps? I don't obsess over amps, I just set them to give me a sound that's pleasing for the environment. For performance I have a Genz-Benz Shuttle 6.2 and a Fender Bassman 100 V3. I like the way each sounds, but I do note that the Bassman combo has a definite "old school" sound bias built in. That's fine with me, as I'm an old school player.
Perhaps I'm in the minority too, but I'm happy about it. I simply set up a bass and amp to sound pleasing to me, and then I play them. Since 1967, no one has ever complained about that approach.