Structured editing reduces timing mistakes
Separating start, end and text makes it harder to accidentally corrupt the timestamp arrow or punctuation while fixing one cue.
Global shift solves sync offsets
If every caption is consistently early or late, shifting all cues is safer than manually editing dozens of rows.
Validate after edits
Negative starts, end-before-start and zero-length cues are flagged before export.
Keep raw subtitle source
For heavily styled WebVTT, retain the original because a simplified table may not represent every advanced feature.