Most of us have certain size milestones that are relevant to us, either because it represents a given % performance or because it starts to be life changing.
For those of us who don't obsess about the price daily and/or mostly trade in % it would be nice to be able to set notifications per portfolio for when it reaches a configurable $ amount.
This will work as a reminder of the initial plan and help bring additional management of the portfolio, be it by making us act on a rebalance, cash-out or invest more.