This could be one way how to make 1 to max level fun again, as of now the Talent system is kinda boooooring since you only get 1 talent each 15 levels.
How about this (NOW dont rage on me, read everything before you comment) blizzard makes the Vanilla Skill talent tree come back, that way from 1 to 60 you get to choose 1 new talent point each level (Making it more interesting).
but after level 60 (lets say you have to do a short quest or something like that) you would get the New'er talent system back, Exactly as it is now in 2017.
This way of Hybrid talent system would be great to keep people engaged and to feel like you get stronger each level.
But at level 60 you would get "all of the talents in that specific tree, that way, blizzard would not have to "balance a level 1-60 talent tree and a max level talent tree".
Let me know what you think,
Regards,
Woflrick