Bungie announced plenty of class-related changes in the latest TWAB and the one that is important for all of them is that Destiny 2 will finally have separate binds for melee attacks.
Melee attacks in Destiny 2 are a powerful tool in both PvE and PvP, provided you utilise them correctly. However, the game mechanics would often get in the way of using the attack you want. For example, if a Titan with shoulder charge is sprinting and they notice a wounded opponent who would go down in a single regular punch, they would have to stop moving and then use melee in order not to waste the empowered one-shot ability.
Similarly, if a Hunter is jumping away from a pack of Wretches and wants to throw an Explosive Knife to clear them up, the game would instead lock onto the nearest Fallen and make the hunter use a regular melee stab instead, leaving them in a bunch of angry spear wielders.
All those woes will finally come to an end in Season 15 when Bungie will introduce separate key binds for powered and regular melee attacks. On PC, this will be easily done since you have buttons for days but it can get tricky on consoles where all the buttons have already been assigned. In case you don't feel like adding another bind to your controller, you can stick with the melee mechanics as they were thus far - this key bind will be called Auto-Melee in the future.