n=1 of course, but my dad was forced to write right-handed in school (early 60's and an old-school teacher for those days). The result was more punishment as no matter how he tried, he simply couldn't (and still cannot) write very readable with his right hand. So no, I don't think practice is enough to make somebody ambidextrous. Might work for some, but certainly not for everybody.

It certainly felt real to me growing up. No matter how much teachers would insist that I use scissors right handed, I just couldn't. That being said, with enough training and descipline you can certainly overcome that. As an adult, I can use scissors in either hand but not particularly well.

I always felt like a lot of sites and apps were made to be used left handed anyway. It seems like the controls are often on the left side. Maybe it's just that I primarily used reddit and now lemmy though.