Okay, I'll try. I've found that I really want ~200yds of line on my reels of whatever lb test braid fits (anywhere between 175-225 is fine IMO for anything we'd catch inshore in New England, big fat Albies included). So essentially I've found the following (all using Shimano Reel class ratings):
3000 - Use 10lb braid
4000 - Use 20lb braid
5000 - Use 30lb braid
6000 - Use 40lb braid
I have a series of rods using Shimano Sustain FE's (great reels!) and 7' Teramars... some 8-17lb class rods with the 3000s and some 10-20's with the 4000's. Those 4000 class reels with the 20lb test can go days and weeks without getting any type of wind knot or having to re-rig while I have to re-rig the 3000 one or twice per day using that 3000 class reel and the 10lb braid.
Scoodydoo gave you the primary reason, line management. My personal experience is that anything below that 4000 class and 20lb braid...pretty much sucks to use long term! Yes I have caught enough various fish with those 3000 based outfits but what a pain in the ass having to re-rig 1-2 time per day and having to re-line pretty much monthly when using heavily.
I'd go so far as to say I hate the lighter is better thinking nowadays. I grabbed a brand new 2020 Stradic 4000 this year after reading glowing reviews to try...feels like a plastic toy compared to those older Sustains and has maybe 1/3 the drag surface area, had to tear apart the drag and get some Cal's grease on there with the carbon drag and I'm still not happy with the drag performance.
YMMV of course, there's 1000 ways to skin this cat.