Why do we need SegWit (technical explanation)

Why do we need SegWit (technical explanation)

After reading a lot of articles, whitepapers and videos I am still confused why do we need SegWit an Lightning instead of just bigger blocks. I don‘t want to debate Bitcoin vs Bitcoin Cash but what are the technical arguments? For a non-involved Bitcoin developer the debate is just crazy and both sides have their pros and cons but there must be technical arguments or not..?

DISCLAIMER: I do not have Bitcoin Cash but Bitcoin

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