wouldnt be in this mess if these deals were negotiated to benefit regular people and not just corporations
But - mostly - they HAVE benefitted regular people.
If you work for a company that sells products outside Canada, you have benefitted.
If you are able to buy something from outside Canada that is not available from a Canadian source or is less expensive when imported, you have benefitted.
If the company that you work for is able to sell its products more competitively because it is buying parts from elsewhere in the world, you have benefitted.
If the company you work for is able to reduce cost by making higher production volume by being able to supply customers worldwide, you have benefitted.
If you are able to buy a product for lower cost because a company was able to build worldwide production in one place (whether here or elsewhere), you have benefitted.
One of my customers, for example, specialises in making certain engine parts for the automotive industry. They are a Canadian company. They have plants elsewhere in the world. They have, for example, a line running here in Canada that makes parts for a certain engine family that is sold worldwide - by a company that has a European nameplate but assembly plants all over the world.
My van had final assembly in Mexico from bodyshell parts that were stamped in Italy with a transmission assembled in the USA which contains parts that came from Canada (and elsewhere) and an engine assembled in Mexico from parts that came from Mexico, the USA, and Canada. A customer of mine (Canadian) builds the oil pumps for those engines.
If you buy a BMW SUV it's assembled in Spartanburg USA with bodyshell parts from a nearby Magna plant (you might have heard of that company), and it contains a German-designed but American-built ZF transmission that contains parts made in Canada. If you buy a later-model Chrysler with the cousin of that transmission, it's assembled at a different American plant but it contains some of the same internal bits and pieces that were made in Canada.
This is how the auto industry works nowadays.