That is easy to say, but there are far more flat tops available that are more mod appropriate than button top.
If you want top quality in button top you are pretty much limited to AW and a handful of eFests.
And what is the problem with AW or eFest?
If you are using a regulated device you don't need Sony VTC batteries. I don't know of any other battery that is recommended by manufacturers of regulated devices other than AW.
Any device that can only use button top batteries is one way to add reverse battery protection without having to add something in the chipset itself for that. To my knowledge there are no Dual Button batteries, buttons on both the top and the bottom. So if the device only works with button top batteries and you insert the battery backwards, negative end in first, the device simply won't make contact with the battery.
Also there is no device being made that will only work with flat top batteries. If it works with flat top it will work with button top.