Tagging this but not replying to you but the OP.

If buying a gift for your sister, don't be a cheapskate and buy 2nd hand. If you are buying for yourself, that should be alright. You wouldn't know the condition of the unit if it's used by another person.

FWIW my 1.5 year old niece likes to grab anything in the house and throw them on the floor despite several warnings. The mobile phone was thrown many times and fortunately it is still in one piece and working. You wouldn't know, after buying a used phone it fails to function within 1 or 2 months. Better buy new even though it's a lower spec model than 2nd hand higher range model where it's a lot riskier.

depends. i bought used pixel 2 for bibik using her own money in 2020 coz she dont know which one is better for little budget and she's loving every second of it till now. of course i disclosed to her it's a used unit but she dont mind. its her 1st phone with whatsapp so she can video call her family in indonesia. the phone is still in use till today.

another case is my wife, i bought her a used Galaxy S10 pink flamingo back in 2021 and she likes it so much and its still in use today. it looks so new till when i go to shop to have glass sp installed, the shop asked 'is this new?'. the phone performed very well as well and last year i bought her 512GB micro sd coz the 128gb internal is getting full with photos of our newborn.

sorry guys i am not rich, i also use a used Galaxy S10e myself. i'm just happy to know that people i know loved the phone given to them despite it being 2nd hand. for me, its important for the phone to be flagship, so can have full features. but not new coz too expensive. so i settle with 2nd hand.