I do know many children and families for who the epilepsy really is destructive and has influenced and still influences their lives continuously in a negative way. Severe childhood epilepsy and epilepsy syndromes as well as side effects of heavy medicine cocktails and other treatments like ACTH, prednisolone and other hormone treatments as well as a ketogenic diet or non successful brain operation, can make a kid continuously suffering, can make his or her life very uncomfortable, can be disastrous for their motor and mental development, can cause severe degeneration and mental retardation, can affect learning abilities and can cause severe behavioral problems.
Apart from having to cope with seeing your kid or sibling so miserable, many hospitalizations, visiting doctors and specialists, applying for all kinds of adaptations, having to move to another house that's suitable for your kid, special needs devices, care facilities, education and daycare, limited accessibility, loosing jobs and careers, having sleep problems, relational problems, other kids who need attention etc. etc. can influence a families live enormously.
Epilepsy hasn't ruined my life, however my son has a disastrous syndrome and is severely handicapped, we've learned to cope with all this. But I certainly do know families that rightfully can say it has ruined their life
It depends a lot on how severe the E is, how well the E is controlled, what the consequences are and how you personally can cope.