Understanding Issues with Unbordered Stone Beds

What happens here

The presenter introduces the topic of paver borders and immediately highlights a common landscaping issue: stone beds directly abutting a lawn without any border. He explains two main problems arising from this: first, rocks from the bed are easily kicked or thrown into the lawn, creating hazards and maintenance headaches; second, grass from the lawn inevitably invades the stone bed, blurring the intended line and making the landscape appear messy and undefined.

Goal: Identify the problems that arise from having stone beds directly adjacent to lawns without a border.