Exactly!
Termagax is a scientist, an engineer and one of the most brilliant minds to ever be seeded by Cybertron. Her being Megatron's mentor is barely a shred of her importance to the story. Termagax moves the story more than stated, through her early speeches and dissatisfaction with the way Nominus Prime leads Cybertron.
She not only started what would become the Decepticons, albeit only after Megatron took the idea and twisted it so Cybertron would fit his beliefs, rather than what Termagax espoused. Termagax did not want a violent end to the ruling government, but to take power through the choice of the populace. In her second (and last) in comic encounter with Megatron, she explains her viewpoint and how Megatron's view clash.
She wants change through a collective choice of the population, not Megatron forcing that choice upon others through threat of force, policing the streets and not allowing anyone a voice unless they are in agreement with him.
Termagax and Megatron are two people who have seemingly identical desires, but actually don't. She may have given him that avenue of desire for changing the world they lived in through being his mentor, but Megatron is his own person. She did not cradle him into her beliefs, he already had them, then had his own beliefs heightened by hers, but he took that to the extreme while she retreated inwardly at how the government turned against her ideals and pushed her away.
A government which she took part in! She was a senator and part of Nominus Prime's council, a post she took specifically to try and change the government from the inside.
And it was not simply Termagax arguing for expansion beyond Cybertron, she was arguing against Nominus Prime shutting down the Forge Pyramid - as in, how new Cybertronians are born and brought into their world - in an effort to ration energon expenditure. Nominus Prime believed the best way to restrain Cybertron and its population was to prevent new mechs from being brought online.
And the very first issue of this entire continuity made it clear what Termagax's thoughts on the future generations was:
"You owe everything to those yet unforged."
Of course she would fight against Nominus Prime's want to shut down the Forge Pyramid, to restrict what new Cybertronians come online and join the population.
She is so much more than "Megatron's mentor", and never, ever, has been deemed his mother. I just wish people would be introduced to Termagax through far more than the consensus of "she's Megatron's mom" because that will color (and has) how people think her story should be told, and what her general purpose within the overall story, of IDW2019 but also beyond, should be determined by.
