- Every block longer or equal to 7 days should be Wikimedia-wide.
- The fourth block on two days in, let's say 15 days should be
Wikimedia-wide.
- The fourth block on one day in 7 days should be Wikimedia-wide.
- And so on...
So, here is "better" group of reasons:
- If en.wp (or any other approved by WMF) ArbCom decided to block
someone on 1 year, I really don't want to see such person on any other project.
Do you still remember recent Russian Wikibooks story, when some users were permablocked by the only admin for no apparent reason? Under your policy, they would also be permablocked on all other projects.
Cheers Yaroslav