Databricks started in 2013 when Spark sucked (it still does) and they aimed to make it better / faster (which they do).
The product is still centered Spark, but most companies don't want or need Spark and a combination of Iceberg and DuckDB will work for 95% of companies. It's cheaper, just as fast or faster and way easier to reason about.
We're building a data platform around that premise at Definite[0]. It includes everything you need to get started with data (ETL, BI, datalake).
Aren't the alternatives you mentioned - icerberg and duckdb - both storage solutions while spark is a way to express distributed compute? I'm a bit out of touch with this space, is there a newer way to express distributed compute?