You can make competitive lists without the Kroot, Vespids and Etherals, thats just a matter of play style. However, without the tanks your in a world of hurt.
Hammerheads are the backbone of nearly every Tau army, Mech or Static. Their versatility, mobility, and shear killing power make them one of the best tanks in the entire game. Without the tanks you will lose hard to kill wepons platforms that can shoot either solid slug rail shot (st10, ap1) or the slightly weaker pie plates of doom.
Technically, yes you can make a list with only broadsides and Helios Crisis taking over your anti-armor roles, and in fact they can do the anti-armor better than railheads can, where your gonna find yourself lacking though is in the anti-troop category. Hammerheads can cut swaths through light and medium infantry like they were nothing more than strands of grass, they can thin out horde armies and take some of the heat of your Elities and FW's, thats not an ability or unit that can easily be replaced.
I think we could help you more if you explained to us why you dislike the Hammerhead.
Hammerheads are the backbone of nearly every Tau army, Mech or Static. Their versatility, mobility, and shear killing power make them one of the best tanks in the entire game. Without the tanks you will lose hard to kill wepons platforms that can shoot either solid slug rail shot (st10, ap1) or the slightly weaker pie plates of doom.
Technically, yes you can make a list with only broadsides and Helios Crisis taking over your anti-armor roles, and in fact they can do the anti-armor better than railheads can, where your gonna find yourself lacking though is in the anti-troop category. Hammerheads can cut swaths through light and medium infantry like they were nothing more than strands of grass, they can thin out horde armies and take some of the heat of your Elities and FW's, thats not an ability or unit that can easily be replaced.
I think we could help you more if you explained to us why you dislike the Hammerhead.