Unless you're paying for an upper-tier pistol, there aren't many factory triggers that come "crisp and clean" and 4-5lbs. That's a simple side-effect of economic factors. Tuning a trigger requires skill hand-work or tightly controlled manufacturing tolerances (or both), and at average shelf prices--even for decent quality pistols--you won't get a lot of hand-tuning.
Understanding that to start with, if you want someone to tune a trigger for you, it will be easier to do a nice job on a pre-80's series trigger. That's not to say an 80's series trigger can't be tuned--it can, and to a point where you'd need a magic finger to tell the difference--but it requires more work...which means more cost.
On the other hand, an 80 can be given an "acceptable" trigger job with not too much trouble, and you always have the option of removing the 80s-series parts, adding a shim and converting it to the simpler trigger.
Short answer, I wouldn't let the 80s series safety stop me from buying a pistol if the deal was right, but if I'm looking at two pistols and all else is equal, I'll buy the one without the 80's series parts.