Are you saying that it’s invalid to build up a picture of the geologic column based on correlations of strata across long distances?
Well that’s trivial to do, here’s a random, recently-published example that you could have found with just a few minutes of googling:
https://pubs.geoscienceworld.org/gsa/geology/article/42/7/571/131590/
I should also point out that bracketing isn’t the only dating method available, there are also techniques that can be used on younger (but still ancient) timescales, such as 26Al/10Be that can date the very sediments remains/fossils are buried in. See this recent paper for an example: 26Al/10Be Burial Dating of the Middle Pleistocene Yiyuan Hominin Fossil Site, Shandong Province, Northern China | Scientific Reports
Here’s an example of dating sedimentary rocks (black shales), rather than igneous rocks, to produce a bracketed age for a fossil:
https://pubs.geoscienceworld.org/gsa/geology/article/46/2/135/524864/