Reels should be robust capacity, conventional lever drag reels to allow for rapid deployment of lures into the spread and then incremental fine-tune drag adjustments for hook penetration while also allowing a fish to take drag on initial strike, which is often violent and intense, if the drag were engaged to full it would result in catastrophic gear failure
After spending months underwater as nymphs, adult mayflies emerge to mate and die
Then we have yearly maintenance where you have to disassemble the reel, clean it, remove corrosion if there is any, lubricate it, and assemble it again
Overfilling the spool will result in line ballooning off the reel and causing catastrophic birds nests
Selection varies by store and by season, so think of this as a realistic look at what you're likely to see, not a perfect inventory list