If they cut the transaction time from 10 minutes to 5 minutes and kept the blocksize the same for the five minute transaction that would, effectively, double the total throughput.
(facepalm)
i understand the human utility of desire for faster confirms... but
but to do such, has many ramifications and complexity and having to change many things that can affect and risk many other things.
EG it messes with the coin creation metric. difficulty rate. and also difficulty retarget time. and many other things.
for instance. the difficulty retarget (2016blocks in 2 weeks) would become 2016 blocks a week
for instance. the block reward halving(210000 blocks (every 4 years)) would become every 2 years
so then does the decision becomes:
let the reward halvings happen every 2 years meaning 21mill cap stays but cap reached in 66yrs instead of 132yrs
or move the goalposts and end up having more than 21mill coins
to implement it, is not only far more tweaking bitcoin away from bitcoins main rules that should not be changed. but also to implement and activate
is more of a hard controversial fork that could more easily lead to an intentional split.