reason #1 why OBS specifically says warns not to record to MP4 .. inability to recover from corrupted file
Hopefully someone more knowledgeable than I will respond... but if you search the forums most responses I recall reading are that if you record to MP4 and something/anything goes wrong, the resulting file is unlikely to be usable (but that doesn't happen if you record to MKV and then if required, remux to MP4 once recording completed)
no whether someone could require something from that file... I can't say... but I wouldn't have high hopes... good luck