Others are befuddled why the guitarist just cant get a line 6 and go direct.

Jim, do you expect that a whole generation who grew up on Taco Bell, Chipolata, McDonald's chicken nuggets, not hamburgers mind you, and are now probably vegan, Rap and Hip-Hop, who walk around with a computer, smart phone, in their hand, texting with their thumbs all day and night, listening to free downloads of MP3's, and who's favorite interior color scheme for a house is gray, to know the difference about anything anymore?
Things have changed, some for the good, some for the bad. A whole generation has been raised up on computer and cell/smart phone music, MP3. They are comfortable in the digital realm. It's faster, you don't have to go through your record collection to find what you want to listen to, it's light weight, I just sold 95% of my 800+ LP's, and a lot of it is FREE!

Many of these have never heard a good LP on a quality tube stereo. And many have never heard a good guitar/tube amp combination live. Heck, many have never heard a good live band or even a good band recorded.
Bass players are worried if the sub bass bins can handle the tone they want.
I don't like the newer 'sub bass' heavy sound at all! Wreaks the bands mix, muddy, overemphasized bottom end. Years ago they would take that out in the recording studio and live sound. They'd roll it off with the board EQ and/or use mics with a bass roll off switch. Now they pay big bucks for sub harmonic amps and sub woofers.
Singers (these days) want the stage quiet...
Yeah, 'I can't hear myself.' Is it just part of the pampered, self entitlement mind set? You have to be able to hear yourself at least a little, but I've seen it in church where it's just ridiculous. Many clubs/bars, if they had stage monitors, WOW!!!!!!

And I've seen where they give each musician/singer their own monitor mixer on stage with their own ear buds. But, if they mix their own voice louder than the band in those ear buds, even though they can hear themselves, they'll still sing out of tune. You can either sing or you can't.
My wife, who knows good sound (she's had to listen to my sonic onslaught for gosh sakes!) had one comment. That real Hammond on the left side sounded REALLY nice compared to that fake one on the right side of the stage. Well, that REAL Hammond was a REAL B3 with a MICED(!!!!!!!!!!!!!) Leslie. The "fake" one was a $5K Nord.
Yep! NOTHING, and I mean NOTHING sounds like a real Hammond tone wheel organ and Leslie! NOTHING!!! They sound sooooooo good, that I want a Hammond/Leslie for myself, and I can't really play keyboards!
By the end of the show the house sound was at about 130dB.

What? Did you bring a dB meter with you to the show?