I got an idea to rebalance natures. Let’s take, say, a bold pokémon. The attack stat is reduced by 10%, minus 10% of the neutral defense stat. The defense stat is boosted by 10%, plus 10% of the neutral attack stat. What you get is a compound boost/debuff so the give and take is actually even (Like, if both attack and defense were 100 neutral, it would result in 80 attack and 120 defense). Of course, a stat can never be lower than 1.
Ehhhh… I think if you’re going to do this you should really commit to it and get rid of the flat 10% entirely (and maybe change the proportional part to 15% or even more). It’s not a terrible idea, and it solves the problem of natures that sacrifice your unused attack stat being obviously the best choice (Alakazam, for instance, no longer gets very much out of sacrificing attack, and needs to sacrifice special defence to get a meaningful boost to speed or special attack). On the other hand, I think it’s significantly harder for new players to understand than the current system. It also discourages using Pokémon as mixed attackers, which is unfortunate – a Pokémon that actually does have two high attack stats, like Infernape, can get a lot more out of its nature than most Pokémon do by focusing on just one attack stat, which seems contrary to what Game Freak actually want us to do with Pokémon like that.