Congratulations, you are amazing

Unfortunately, people aren't a amazingly lucky as you. On my first time traveling to Argentina as a tourist customs asked if I was a tourist AND questioned me about my bags. Just because it didn't happen to you...it does happen...period
19 years.
between 30 and 40 trips.
I am not lucky.
I have brought all kinds of extremely weird things, and this has been my personal experience.
I am undoubtedly weirder looking than you.
I have undoubtedly brought much stranger things in repeatedly.
(2 sewing machines, a CNC embroidery machine, a knitting machine, 2 different amplifiers, 2 DJ mixers, 3 or 4 different sets of speakers, a guitar amp, several pieces of knocked down furniture, 6' sonotubes full of rolled up artworks, pots and pans and kitchen appliances and hand and power tools and lots of large amounts of art supplies, hardware, a couple of looms, a canon printer, tons of hard drives, and the aforementioned 5 meter long stair rail, and even a knocked down bathtub sized shower curtain bar. Large quantities of packaged foods, spices, condiments, including several dozen momofuko noodle packs one time. and a bunch more things even weirder)
I have no idea how many trips thru Argentine Customs you are basing your opinions on, but mine are based on a lot of different trips on different days, months, times of day, and obviously a very wide range of customs officers.
Certainly some people get questioned.
Certainly some bags get opened.
Were you made to pay duty?
Were you taken aside and made to fill out forms?
Did they confiscate anything?
Pat downs?
I have had these things happen in other countries, including the USA, but never in Argentina, except that one time my wife had a hardboiled egg in her purse. They WILL make you fill out forms for that, and it goes on your permanent record card.