There are some eskates that have load resistors so the excess regen power can be sent to the resistors when the battery is full.
I live with a downhill start on my daily commute so never charge above 98% to avoid it. Its really not a big deal once you read the manual to understand the limits and warnings from FM.
For me load resistors would just add weight and complexity to protect for a scenario which only occurs for a very short duration of any ride. I like FM's approach to keep it simple.