With more communities, it is more of a mess to manage. If you just curate Pal you potentially alienate many users. Pal is also the best case scenario, when you start looking at other tribes that are niche, it becomes even more of a problem.

Imagine only curating SteemAce? You would be limited to only gaming posts, or you would waste your SteemAce voting power if you went outside of that niche as your Steem voting power would become out of sync.

Even more of a problem when you have a lot of stake, and don't want to vote everything for $3 on Steem, yet anything less than your 100% on SteemAce/Pal/SteemLeo and other tribes is pathetically low.

I've seen a lot of people start making alt accounts to handle their voting power on different tribes, but this means 2-10 additional accounts just to manage your voting power on these tribes. A good example, my PAL power was always 97-100%, yet my Steem voting power is usually 88%-100%. They usually differ by 10% and my PAL is frequently 100% for hours wasting a vast majority.

There is just so much cognitive load to handle these tribes, and that's not just min/maxing either, when you lose half your voting power it isn't about min-maxing.