Streaming platforms often compress audio or offer only a single dubbed track. The original DVDs contain high-bitrate AC3 audio in both English and Spanish (or French for Canadian releases). For parents raising bilingual children, the truly interactive switching of languages via the DVD menu (without stopping the episode) is a feature lost to time, but preserved in the ISO.
Store ISOs on parity-protected ZFS arrays and replicate to offline hard drives (LTO tape if possible). Avoid cloud storage due to copyright takedown risks.