The existence of solutions to problems does not prevent you from solving the problems yourself anyway, if your goal truly is personal development. You're free to go solve Navier-Stokes yourself right now. You're free to manually do all of the AI work in any field, actually. You won't get grant money or prestige (which are not a part of conceptual understanding and insight) but you will get all of the conceptual understanding and insight you're after. You have not been deprived of it.