Looking for insights: Migrating 100–300 Power BI reports to Sigma (Snowflake backend) – POC, bottlenecks & best practices

Hi everyone, I'm currently working on a proof of concept (POC) to migrate approximately 100–300 Power BI reports/dashboards to Sigma, where the underlying data already resides in Snowflake. The goal is to evaluate two possible migration approaches: Traditional migration (without AI) AI-assisted migration (I've heard Sigma may have migration capabilities/skills, but I'm still exploring what's available.) I'm trying to understand what the biggest challenges are before building the POC. Some of the questions I have are: What were the biggest bottlenecks you encountered during a Power BI → Sigma m