We anticipated that question :)

RudderStack is focusing on replacing Segment.com completely, we focus only on a part of the problem: getting events to DWH. Also, we don't have a UI.

By narrowing down the focus, we think we can do a better job sending data to DWHs. One example: we automatically create SQL schema based on JSON structure. You can send

{ "any": { "custom": "a", "field": "b" } }

To EventNative and we'll create any_custom and any_field columns in DWH table on a fly.