Looker Studio puts reporting in the hands of non-analysts
Looker Studio was designed for people who will never open a SQL editor. A marketer points it at a GA4 property or a Google Sheet, drags fields onto a canvas, and shares a link without asking anyone for help. Because it is free and browser-based, a marketing team can own its reporting end to end, which is exactly what Mode does not set out to offer.
Its limits are the mirror image of Mode's strengths. There is no SQL editor, no Python, and no notebook, and calculated fields with blended sources only stretch so far before an analyst would rather write the query directly.