It’s a great ambition to replace Excel and many went down this path before. Congratulations to even attempting to achieve it and going this far to do it.

Excel compatibility, when fully realized, will remove the major obstacle to adoption. Given the current stronghold Excel has on the market.

Once that is achieved do you plan to offer a transition to more modern forms of calculations as vectors and arrays formula panels together with frozen sheets of raw data and output? Thus separating logic and model.

Also when your solution adoption will have grown much larger you should learn from the experiences Bavaria and CERN went through. Microsoft stronghold more often than not has nothing to do with technical prowess.