As we know, it does take a second or two to select a perk in mid game, let alone when it becomes available, you cant always select it right at that moment.
So why not allow us to select our favorite perks ahead of time in the hero selection screen as an option?
If we know what we like as perks, then this way it is already selected, and become functional as soon as its available in game automatically.
This way, it will not interrupt the flow of the game for us.
Either make it this way across the board, or have it as an option.