Watching streamers last night it was a bit odd that they have to open up their perk choice then select m1 or m2. The 4 streamers I watched all had decided which perks they were going to choose for their heroes after a couple of games. They didn’t need to see the descriptions again.
Why not simply give 2 key bindings to choose the new perk directly once it says you have levelled up? I mean, it says in the bottom left you have perks available and you click [ or ] to choose left or right without having to click left-alt. And if they are bindable you can pick whatever keys you want.