I received an M.Eng. from Cornell roughly 1 million years ago.
I received no RA or TA offers. But I would not have been qualified for same anyway. I was not an engineering major as an undergrad, I was a physics major.
They did, however, give me a pretty lucrative summer job helping out in a lab. That was very welcome, but was not promised or expected before I signed on.
At the time there were labs around campus that gave part time jobs to students as technicians of various types during the school year. I knew an undergrad who had a job like that. But he actually knew something useful, to get hired for that. I didn’t.
I encountered a number of M.Eng. students who were funded, wholly or in part, by companies. Those people all worked for those companies well prior to starting their M.Eng.
Instead of a thesis, the culminating work of an M.Eng. there, at the time, was a design project. The students I knew who were sponsored by their companies were doing design projects that were specified by, or approved by, their companies.
The program gave me (part of) the engineering knowledge I lacked, and enabled me to access the engineering college’s career center to interview for jobs. I received several job offers, for jobs I clearly I would not have qualified for if I’d interviewed for them after undergrad. But like I said, I was not an engineering major as an undergrad.
My starting salary, at the time, was maybe 2-3 thousand dollars more than a BS received. At my firm, there was no difference in placement between M.Eng. and BS hires, they did exactly the same jobs. After hiring, salary increases and advancement depended entirely on an individual’s performance, the M.Eng. was irrelevant. So was the school.
I can’t comment on what goes on now, so take this FWIW, which may be not much.