Your partner also quits their good job. That good job might not be available if you come back, congratulations, you're back at years of job hunting and job hopping to be where you were years before. In the new country maybe this was not a concern and the other partner who was just laid off had a great salary to cover.
Your kids leave their good school. Now that school no longer accepts applicants and you're stuck with whatever you can find on a short notice.
This list is far from comprehensive.
So you're going "all in", hoping for a giant reward (aka to make more in a year than the average Indian makes in their lifetime). It doesn't work out. That's part of the risk of going all in.
Or you don't go all in, you don't move your family immediately, and you have a much lower risk for the cost of paying for a flat in Canada and one in India for a few months until everything has settled and you're confident enough.
Three months salary in a tech job is more than most people make in a year.
If you are moving overseas, maybe wait before selling all your stuff until you pass probation. This idea that you should be guaranteed three months is so backwards. You are on trial.
Tell me anyone’s advice that goes “we should fire slow, hire fast”.