It's probably not as big of a deal as you think. If you're piloting an app, you're probably going to stick to just Android for rapid development or perhaps iOS for the larger market share in certain categories. Eventually if you get big enough to justify supporting multiple platforms, you should be able to get enough staff to support them all individually.

If you're building for all platforms with no indication that your product is of high value, then this might be even beneficial for developer focus on finding product market fit.