This is very much how I was raised, however not how I'm raising DC. In fact this is very much why I have preferred 'presence over presents' since my teens.
Did they ask for presents? Or did you just decide to get them one and are now deciding how they should react to it? Would you care whether they liked the present or not?
You might find tasks like writing thank-you notes as routine and enjoyable, and that's you. However, I associate it, mostly, with being compelled to be insincere. Did 'x' really love their writing set? What would you write if they didn't?
My parents encouraged honesty, until it came to receiving a gift. Sometimes gifts were wonderful, but sometimes they were from a relative who I didn't see often, or bought by a friends mum who had no idea what I liked/didn't like. Maybe the gift is something I didn't want or need, or had outgrown, or already had. However, you can't say that to the giver because that's rude. So, whilst 'honesty is the best policy' was usually the rule, here we're going to throw that rule out the window and teach children about white lies to save someones feelings. Giving is an act of generosity....that is basically law and not to be argued against...and as our society values manners and stoking the ego of the gift giver above all else, we're going to send a note full of lies to x's mum who bought you that personalised money box even though you already have one at home which you love...as we need to make sure she feels good about herself. Or, so what if Great Aunt Muriel has bought you a my little pony every year for the past 15 years and you stopped playing with them when you were 9, you call her now and say thank you. Sod carbon footprints, it's about being polite.
Ugh.
Sticking with 'presence not presents' is so much easier and more planet and wallet friendly. Come to the party if you wish to, spend time with us (better than any gift anyway imo!!), make memories and leave without my family being indebted to your expectations please. If you hand me a gift in spite of this then we'll say thank you at the time but don't be holding your breath for a thank you note.
That being said if I have capacity I do I usually try and film my children opening a gifts if the giver isn't there. It's tough because I'd rather not have my phone trained on them for all these moments, but equally it's less effort than thank you notes in a time where time is the most precious commodity. When they're jumping up and down and squealing about a gift I'll send the video. If they say 'oh we already have this!' then I'm usually audibly on the video saying 'We do! Oh well. Thank you anyway 'x name', then I dither...but often still send the video. Am not here to make you feel good or bad. You decided to send the gift, have the honest reaction to it.