Basically, if the code allows for any mining fuckery, someone is going to hit it.
So breaking transactions to prove a point?
If you divide it by 1/2 then you can multiple the fuckery by at least 2 or more.
It's currently divided by 1/500000000, so I'd say dividing by 1/2 would make it better, not worse.
So, back to your proposal, It would take roughly 9 hours until the difficulty drops to 1, and mind you, there must be a single honest ASIC who would not abuse the 20 mins rule and won't mine his own blockchain, that honest guy would mine the 1/2 difficulty block and disappear for 20 mins, come back, hit a block, go offline, do this for 29 times just so that the broke folks can mine on testnet4, we all know nothing like that is going to happen.
In myh proposal, the difficulty would go back to normal after each block. So if an ASIC mines the 1/2 difficulty block, he can indeed do that again 20 minutes later, but it won't keep dropping. So if a large ASIC would disappear and the difficulty is too high for the remaining miners, the next block may take 20, 40, 60 or more minutes. After that, the difficulty goes up again.
a 1 PH worth of hashrate has been hitting testnet4, so whoever is doing that shit doesn't seem to give a flying fudge about cost.
I'm not very up to date on mining costs, so I'll ask you: how much would that cost per day (in missed main chain revenue)?
If difficulty doesn't reset = CPU will never hit a block.
If difficulty is always 1 during the entire epoch = thousands of blockchains will be created and constant block reorgs, all nodes will be rekt.
If difficulty keeps growing forever = even small ASICs won't be able to hit a block.
And the latest gig: mine empty blocks.
There is really one possible fix to testnet and that would be a consensus of resting the entire blockchain at block x, x should not be anything more than 1,000, with a "currency" that resets every 2 hours, nobody would want to hoard it.
That means there would never be any halvings and it pushes testnet functionality even further away from real Bitcoin.