That's clearly a preference thing and you'd get far more mileage out of a mincost soldier. Both rogues are easily replaceable and the number of situations where they would actually being useful are small.

You would choose to focus your resources on mincosting them anyway. Fine.

But you would want the game to slow down for you so you could focus on more important units, when that's what you should have done to begin with. That's not fine.