In the Nintendo 64 era (and previous iterations) Zone Hitting was the norm in Ken Griffey Baseball (Still the best couch play video game of all time).
In the early 2000's Direction or "Hit Stick" interfaced were added to The Show and ESPN Baseball as the new hotness because it better simulated the act of swinging a bat.
I started playing MLBTS as an online game in 2016...I had actually stopped playing video baseball games when EA's NCAA Baseball disappeared. In 2016 I used the option for 'full swing.' This was actually the most challenging way to play MLBTS because each batter required different timing to both pull back and swing forward. In 2017 I discovered how much easier the "Flick Stick" method was...no real skill there. In 2018 I made it a mission to learn how to use the PCI again because that seemed to be the standard through which the developer streams and most forum posters were describing as the norm.
The long and the short of my experience is thus: The 'Flick Stick' is cheap. PCI is the accepted norm. 'Full Swing' is still the most challenging way to play, but that extra challenge means the results will be minimal compared to learning Zone Hitting. People shouldn't be judgmental of how others play the game...SDS needs money from as large a player base as possible for you to have access to your god-squad names/images.