Sending LTC to a NON-SEGWIT address? Why? Sending LTC to a NON-SEGWIT address? Why? r/litecoin BTC LTC test

Recently I became extremely "re-confused," on the whole point of Segwit being "test-netted," and then implemented first on Litecoin (and isn't it now on Bitcoin? Correct or incorrect about BTC?).

Segwit was clearly an ADVANCEMENT was it not? Then why are people still wanting to require SENDING to NON-SEGWIT addresses? What is the advantage of ...