@jamalas1
IMHO: many years ago, when wx. models provided output only for rain,
it was usefull to have LI, K-index etc, to forecast tstms (or showers).

Now, wx. models (e.g. ECMWF) provide thunderstorm forecasts (light-moderate-heavy), can separate rain-snow-tstms and even provide lightning (density) forecasts.
Those forecasts are considering a lot of parameters (including instability).
I don't think that by consulting one parameter (LI index), I can forecast tstms in a better way than the model which takes into account a lot of parameters.

Personally talking, convective available potential energy (CAPE), already provided by windy, is a better measurement of instability.