Everyone uses 10% of the features of complex software... it's just not the same 10%, which is why the other 90% needs to be in there and included in the file formats.
It's also not sufficient to find that "perfect" lean and mean application that happens to cover precisely the 10% that you need for yourself, because now you can't interchange content with other people that need different features!
I regularly open and edit Office documents created by others that utilise features I had never even heard of. I didn't know until very recently that Power Point has extensive animation support, or that Excel embeds Python, or that both it and Power BI can reach out to OData API endspoints to refresh data tables or even ingest Parquet directly.
You might not need that, but the guy that prepared the report for you needed it.
It's also not sufficient to find that "perfect" lean and mean application that happens to cover precisely the 10% that you need for yourself, because now you can't interchange content with other people that need different features!
I regularly open and edit Office documents created by others that utilise features I had never even heard of. I didn't know until very recently that Power Point has extensive animation support, or that Excel embeds Python, or that both it and Power BI can reach out to OData API endspoints to refresh data tables or even ingest Parquet directly.
You might not need that, but the guy that prepared the report for you needed it.