I think you understand my question wrongly. If I may use an illustration:

Suppose there is a token called Mii that works on ERC, BSC, Matic, and Tron. What you propose is a feature where there will be a graph that shows this token's price growth on every chain, right? And mostly (as you also agreed) investors would measure their portfolio on USD and not on the chain's main coin (to make it clearer, people would measure their growth with Mii-USD instead Mii-ETH or Mii-BNB).

I can't be sure how will you serve this graph, but I imagine there will be one graph with multiple lines that represent the growth of Mii in each chain it's on, like Mii on ERC is represented in red line, Mii on BSC is on blue line, etc. But, since most token developers has a way to automatically balance their rate cross-chain, wouldn't these lines on your graph shows an almost identical figure, which renders the feature rather useless.

I'm not saying it's a stupid idea, I actually think it is quite beneficial for people who want to arbitrage their portfolio cross-chain if the graph's update rate is very fast and a token developers didn't adopt the auto-balancing method, I just tried to understand the likelihood of this event (a very up-to-date graph that's renewed in seconds and a project that didn't use auto-balancer) to happen and whether the feature will survive if the likelihood of the event is somewhat low.