> What OP's "hypothetical portfolio" means is basically the tracking of a whole set of selected equities (so in your site's case: the performance of everything within a watchlist, including a graph visualizing it plus all the common features like comparing that portfolio-graph to that of the Nasdaq, Dollar Index, BTC ...). [2]
> GF's UI was horrible, but they allowed to create endless amounts of those portfolios, which was really helpful for finding one's investment strategy because you could compare "ideas". Or you could gather groups of similar equities to track their performance and decide whether they are ripe for becoming "a new idea" (like "I believe that downturn of x is at some point going to halt, maybe then it's worth investing")
I just want to second this point made in the parent comment. What I've always wanted to do that I can't really do in an app out there, is compare my "what-if" scenarios (e.g. what if I had held onto 20% of my AAPL in 2015, instead of selling and buying NFLX and UA/UAA?). I always imagined that there'd be an easy visualization comparison between two scenarios, to allow me to "evaluate" certain buy/sell decisions I've made, retrospectively.
This is a super helpful set of points. I've always had similar questions to your AAPL/NFLX/UA examples. I think the insight here, is that brokerage accounts and most sites treat your "list" as binary - you either "own"/"track" something or you don't.
In reality, you're tracking a lot of opportunities, and every decision you've made represents several different scenarios. It should be as easy to look back on a scenario (AAPL versus NFLX+UA performance over the last 3 years) as it is to see the performance of any of those specific securities.
You should also be able to easily see that your "biotech" list outperformed your actual portfolio, or that your "tech" list is outperforming your "European companies" list (or whatever else).
We probably won't go too deep into backtesting various strategies, as there is powerful software for that today, but we definitely can support the analyses in this thread.
An app would be a lot nicer to get a graph of performance offer time for that hypothetical decision. Excel would be okay if you just wanted to know today’s position of various decisions.
> GF's UI was horrible, but they allowed to create endless amounts of those portfolios, which was really helpful for finding one's investment strategy because you could compare "ideas". Or you could gather groups of similar equities to track their performance and decide whether they are ripe for becoming "a new idea" (like "I believe that downturn of x is at some point going to halt, maybe then it's worth investing")
I just want to second this point made in the parent comment. What I've always wanted to do that I can't really do in an app out there, is compare my "what-if" scenarios (e.g. what if I had held onto 20% of my AAPL in 2015, instead of selling and buying NFLX and UA/UAA?). I always imagined that there'd be an easy visualization comparison between two scenarios, to allow me to "evaluate" certain buy/sell decisions I've made, retrospectively.