I've always controlled wealth. I don't randomize treasure. I primarily give out gold and have a curated magic mart. People can ask for whatever they want but I decide if it's available.3e even baked this right in to the PH: if your rolled stats didn't give you a cumulative bonus of at least +0, start again.
Indeed - IME after the first few adventures wealth imbalance becomes far more of an issue than stat imbalance; if for no other reason than being rich (be it in items, money, or whatever) often provides the means to get richer, while poorer characters - unless very lucky - can't catch up.
And wealth imbalance simply isn't something a DM can fix without dictating to the players how their PCs are to divide their treasure, and in most cases that ain't gonna go over very well.
Wealth imbalance control is easy if you care.