Everything Removed From GTA Trilogy Definitive Edition
6. The Old-Style Aiming System
In this case, the removal of something from the original games might not be a bad thing!
For the original GTA trilogy, the aiming system is very much a by-product of its time. There was very little free-aiming involved (certain guns did have) and the system instead relied on locking onto enemies. In practice, this could be both useful and a hindrance: it made actually hitting enemies easier, but there was a good chance sometimes the game wouldn't realise which enemy you were trying to aim at, and you could be gunned down before you knew it.
Grand Theft Auto: The Trilogy: The Definitive Edition removes this old style of targeting entirely for a system that's more akin to the targeting you'd find in Grand Theft Auto V. Of course, the original games were never meant to have aiming like this so the results of this can be a mixed bag, but it feels like a bit of an improvement overall.
The implementation of the GTA V-style weapon wheel also makes swapping between weaponry much easier and faster, meaning you can choose a weapon quickly without being shot into pieces and hammering L2/R2 to get to the right gun before realising you've accidentally scrolled past it. Again.