The biggest problem with new chess variants is that, by adding new powerful pieces would significantly decrease the pawns' and knights' power.
The above is a rather dubious claim; in fact the value of a Knight increases by the presence of powerful pieces, as that means there are lots of forking opportunities that can result in decisive gain of material. To the point where (on 8x8) seven Knights easily beat three Queens.
The above is a rather dubious claim; in fact the value of a Knight increases by the presence of powerful pieces, as that means there are lots of forking opportunities that can result in decisive gain of material. To the point where (on 8x8) seven Knights easily beat three Queens.