About the block button I accidentaly mixed it up. My bad.
Regardless, there is nothing wrong with pressing the throw button to tech a throw technically, but for a series like MK that is more offensive based them almost all others, you need to have that aspect of a mixup in some capacity. And because MK11 is not as mixup-heavy as MKX, it make sense to keep the 50/50 aspect of throws from MKX. IJ2 on other hand, is mainly about Zoning, so there was no problem in that game to make the throw tech mechanic being just one button for both directions and not having a mixup aspect for it there, because it's not a Rushdown and mixup heavy like MKX was. Also, having the mixup aspect for throws in MK games adds another layer of depth to the game, as depending on where you are on the screen you need to get the right read. It's not just pressing the button, it's also understanding where you are on the screen and what the opponent can do with his character. That is called "throw psychology". You can see it in this video from Ragnarok, starting at 12:52.