Right now with a 784 tonnes cargo cap. it still takes me forever to supply my construction, 25%-50% would mean less travel and more carrying cap so the grind isn't so bad.
The thing is, there are two solutions to this. The current requirements are already balanced around a single round trip carrying about 750t (large pad) or 350t (medium pad). So to make them easier, if that's something Frontier want to do:
1) Increase ship cargo capacity - either with a larger ship, or engineered cargo racks, or whatever.
2) Decrease the total requirements.
Option 1 has the big problem that it means (say you get a 1000t capacity out of it) that all hauling tasks in future now get balanced around the assumption that everyone has a 1000t capacity, so you don't actually get any further ahead.
You can see this with CGs over time. Back in 2016, a well-attended hauling CG with 10,000 participants had
total hauling of about 5.5 million tonnes. T-9s and Cutters were available back then, but most people didn't have them. Engineering was available but not as strong and not cheap enough that lots of people had it maxed out by routine. So a mean haul of 550t per participant was pretty good going. The current CG ... is getting more than 5.5 million tonnes
per day. The mean haul is now closer to 5000t per participant. All that's happened, of course, is that CG targets are now
also ten times higher to compensate. If Colonisation had (somehow!) come out back in 2016 then it'd probably only take 2000t of cargo to set up a basic outpost.
So if Frontier want to make Colonisation easier, further increases to cargo capacity are probably the wrong way to do it.
(I think "easier" is probably the wrong direction anyway - it's not as if the rate of system colonisation right now is
slow. The total time taken to build is probably about right, it just needs some alternative methods so that it's not all hauling all the time unless you really like hauling)