Aside from the fact that one probably needs to be matir neder before changing a minhag, assuming for arguments sake that all these kashrus issues are just minhagim.
I doubt your grandparents and great-grandparents only ate Hemish brands.
And the point is people are being many times forced to accept chumras and spend more money when cheaper alternatives are available. Living within ones means , means avoiding expensive luxuries and a chumra is just that a “Luxury”