Recently on Facebook, somebody asked, why we don't have a robotic humanoids, known otherwise as androids. Especially 100 years later, in 3150. The tech in BT would surely allow to create these, since we have Mechs, cybernetics and some sort of AI.
I think that Robotic Infantry would be nice to implement...
Robots and androids do exist and have existed in the BTU. Security droids, mobile industrial robots for agriculture, construction, mining, etc. There are references to robotic sailriggers used on JumpShips and robotic tanks known as Guardians.
All present.
In universe, in the Inner Sphere, in the game, such units rare to the point of non existence.
Why?
No comprehensive reason is given. The true reason is that the BTU is written as a human centric universe and robots have a very limited role.
In universe, it isn't discussed but it can be presumed to fall into several categories.
Economic...in the typical time frame of the IS, the typical tech level of the IS appears to have settled around that of the late twentieth century. The support and manufacturing base needed to support androids and robots doesn't exist. With a large population base, there is also less economic pressure to re-develop the technology.
Technical...tying in with the economics, the robots that can be built are often not seen as being as flexible or as adaptable as humans. That could probably be remedied except the big reason seems to be.....
Cultural. There seems to be a general bias against robots, AI and human augmentation within the Inner Sphere. There have been several incidents which suggest robots going berserk has happened in the past, the FWL has its anti-cyberware bias, the Clans and WoB are seen as freaks, genetic science as a rule is not much different from today, genetic experiments such as Frobisher and the Toorima don't help.
In essence, the Inner Sphere doesn't appear to be a culture that welcomes robots, or AIs and one can presume that there is a history or untold story that justifies this aversion. As it is, the only two faction noted as making widespread use of robots and AIs are Terra and the Clans...and the Clans appear happy to keep the technology out of the IS in order to keep their populations busy, tired and out of trouble
Terra? Neither ComStar nor WoB would have shared the tech, Devlin Stone was encouraged to do so but that doesn't mean he did so, or that the offer was accepted if he did. If there is a cultural aversion to robots within the IS, it would be easy to see such help being rejected and seized upon to demonize the RotS.