No the world hasn't moved on.....I like shading inks, and find monotone inks boring.
I never had any problem cleaning out a sac pen....takes as long as doing a piston pen with no twist out nib.
But then again I grew up with them.
And most sac pens are standard or medium-large so do have better balance than most Large pens.
Out side the sac Snorkel a thin Large pen with great balance....posted.
One does have to know certain pens do have good balance; that because when they were sold balance was a key selling point. They have the balance because they are posted.
Such as I find the triple loading P-75 to have great balance, the P-51 to have very good or better balance. The P-45 is sometimes I do, sometimes I don't....it's close....nice balance....at a minimum. Esterbrook has a good but not great balance. I find the Vac to have better balance.
My top three balanced pens are a standard sized MB 234 1/2, a thin medium-large Geha 725 and a silver P-75. The P-51, 600 are good balanced, and I found after some two years of checking the medium-large 400nn had a tad bit better balance than a 400.
Oddly outside the P-75/45 none of my cartridge pens come to mind as having good to great balance.
I did buy my P-75 new....and tossed the box....long before converters....in fact I'd never looked underneath in the box, so was very shocked many decades later the P-75 also took a cartridge.
I do have 60 + inks. Some are monotone....saturated, but I don't know if DA makes supersaturated inks or only saturated ones....to go with the DA shading inks.
Mostly I look for two toned shading inks.
Yep, I find supersaturated inks to be boring. I do have good paper too....that makes a key difference when not dealing with supersaturated monotone inks.