Well, I can start with what Pink Floyd said, because few people ever learned it better than they did.
Come in here, Dear boy, have a cigar.
You're gonna go far,
You're gonna fly high,
You're never gonna die,
You're gonna make it, if you try;
They're gonna love you.
Well I've always had a deep respect,
And I mean that most sincerely.
The band is just fantastic,
that is really what I think.
Oh by the way, which one's Pink?
And did we tell you the name of the game, boy?
We call it Riding the Gravy Train.
We're just knocked out.
We heard about the sell out.
You gotta get an album out.
You owe it to the people.
We're so happy we can hardly count.
Everybody else is just green,
Have you seen the chart?
It's a hell of a start,
It could be made into a monster
If we all pull together as a team.
And did we tell you the name of the game, boy?
We call it Riding the Gravy Train.
Once you have a 'hit' the pressure to do the same - which is pretty much pressure to release a record just like the last one - formula is everything - is huge. And it comes from both the company as well as your mates, who are now spending money like there is no tomorrow, like the Eagles said: They threw outrageous parties, They paid heavenly bills. And those bills, even when you don't see them right away, are being charged to you, so its possible - if not likely - that you have a hit only to wind up in more debt then when you started.
The Dead really don't figure into much of this, as they didn't have a real 'hit' till some 20 years into their gig, and among the fans its was the live records that sold, so much so, that really the Dead fans didn't buy the dead records, they just traded the live tapes back and forth.
The bands that do a bunch of stuff, different stuff, are ones that have either enough clout to pull it off, like Tom Petty. After three huge records, he could tell people to back off, or Neil Young, whose catalog is pretty diverse, even though most people never listed to stuff like "Trans", he was way out ahead of the curve there. And, again, had enough sales to be able to tell people to back off, ditto U2. Frank Zappa never sold enough to get into that problem, so they just let him be.
And, its not just the record companies. Its the other people in your organization, and in your band, and your fans, who really, really, don't want you to change.