If it's a gameplay mechanic it should have counterplay, which in this case either doesn't exist or is switching off "Always Render Strategic Icons"... a setting in the options menu that you don't even have to be in game to access. That's not gameplay. If it was an intended mechanic, Mantis would appear with tank icons for the user - not that lore really matters but from that perspective why would you jam your own sensors?
To a lesser extent it creates the same potential problems for the Cybran using Hunters+Mantis as it does for the opponent. You won't know what your land mix is when just looking at it, and have to remember what you sent where and go out of your way to actually select units in various places to confirm what's what, whereas other factions can just zoom out and know how many LABs and tanks they have and where they are. This is potentially meaningful, especially early, as you might well push in with a LAB in a fight that a Mantis could win but a Hunter will lose, or hang back when you could have raided with Mantis and taken a lead. This goes against the point of strategic icons, which is basically the selling point of the game.
TLDR this isn't really a fun or interesting skillset to punish or reward for either side, and it's pretty hard to believe it's a deliberate design choice beyond "Mantis have legs".