I was pretty impressed with the depth of detail as well, and one thing this seems to have better tooling for than my manual sheet is for tax treatment and long term tracking there
Two bugs/issues I found:
1. I couldn't tell if inflation was applied in future years at all. Despite selecting an increase in income and inflation matched expenses, neither seemed to be reflected when I selected the future year.
2. Setting 401K by percentage caused lots of issues as it allowed me to go over the IRS limit. I just wanted to set it by amount and be done with it! Would be good to have options to allocate savings like that as well as by percentage.
Honestly, this is really intriguing for me as I've covered a lot of these cases and as a developer I've thought about the UI/UX for this but basically have always thought that the edge cases were so vast that it would be hard to get users while also making sa reasonable UX. Truly, using this changed my mind and this seems like something that could be possible. I'm not sure what your team size is and I have limited time, but I'd be interested in talking and seeing if there's any way to contribute / help here! Feel free to contact me @gmail or via my bio's website contact form if you're at all interested in that!