I wasn't doggin on nobody, just arguing some advantages of shop work. And certainly your pipeline perspective is valid. Spent some time on pipelines myself, I still to this day have friends who would wish nothing else, and would be in complete agreement with you, but I never had much interest in firing line hopscotch. But, much outside work, in fact most of it by far, is industrial not pipeline, in which case welders don't have 'helpers', to do their menial stuff, up five, down five, fix my lunch, get my board, (just teasin a little) .
As for craving sameness, in my career in the shops I've welded SMAW, FCAW Semi auto, machine (inner and dual shield), GTAW manual, semi auto and machine, hot wire cold wire and magnetic oscillation, GMAW semi and machine (spray and SC, and metal core), SAW semi and machine and twin wire, Flux Cored SAW semi auto and machine, and Plasma manual and machine, (oh and capacitor discharge too) on carbon steel, stainless steel (austenitics, martensitics, and ferritics), nickel steel, duplex, super austenitics, super martensitics, and super ferritics, nickel alloys, copper alloys, aluminum, Cu Ni, CrMo's, vanadium steels, microalloyed steels, HSLA's, Titanium, and Zirc, small bore (1/4"), large bore (108"), thin wall(sch 5) and heavy wall (6"). I've done work for power (fossil and nukes), petro chem, food processing, and about 50 other industries. I've done low temp, high temp, no temp, in position, out of position, any position, butt welds, fillet welds, o lets, sweep olets, vessel lets, overlays, corrosion and hardfacing. V grooves, U grooves, narrow grooves, no grooves, single and double, uphill, downhill, no hill.
I've been involved in evaluating welds through RT, UT, PT, and MT (inspection in power, especially nukes, takes a back seat to no industry).
And add to that with two positioners, where I started out in California we could easily achieve over 200 diameter inches of std wall pipe welds in a 8 hour day (thats 20 10" welds), and thats no bull. And thats root pass to cap. Not just one section as in pipelines. Weren't no bead hands or firing line in a fab shop. Oh, and we did our own repairs too.
I've lived in four states where welding has taken me, and visited at least 20 others based upon welding. One company I worked for owned about 10 fab shops.
So I'd say there's a strong argument for variety in the shops. I've been very fortunate and I owe it to shop experience.
To each his own.