C10 coil drop vs spindle drop

[Chevy nutcase]

I'm itching to start ordering parts so I can lower my new 66. My original plan was 2 1/2 drop spindles, disk conversion, dual master cylinder and possibly a booster and 3" rear coils. Well after a bit of study I quickly realized my original wheels may not jive with a modern disk setup soooo I priced out new wheels and tires and it's a minimum $1200 tacked on to my original plan. While I was at it I priced out swapping the rear axles for 5 lug which opens up an ocean of wheel choices and woo hoo the $1200 jump is now $1800 on top of the lowering parts. This got me thinking. The truck stops fine with drums so why not just drop it front and rear using coils. Now obviously a disadvantage of this is loss on suspension travel and disks are superior in almost every way but is there a reason I'm unaware of that 99.999% of lowered trucks upgrade the front hardware to disk when lowering over using just coils? I can get my truck down where I want it for less than half of a disk and or 5 lug conversion. I'll completely replace every drum, shoe, spring, wheel cylinder, hard line and soft line and still have a lot left over for other improvements. It will be interesting to hear what you guys think