If the timeline and workload feature worked in portfolios of portfolios, this would solve a lot of problems from us. Please Asana give us this! 
We want to be able to see all projects across the whole organization, but this is so onerous to compile and keep updated for one portfolio. What makes the MOST sense as a workaround to see this globally is to have each team manage their own portfolio (eg “Communications”, “Partnerships”) and to add each of these to the portfolio global/“Organization Projects”. This would then allow our Executive Director to see workload, capacity, state of projects, as well as increasing transparency overall across our org. But without workload or timeline, this is almost useless for us.
It is still better than nothing to see the portfolio status, but could be improved by the above suggestions.