I find this argument to be pretty weak, and seems to be a stand-in for, "I don't want to use a new technology because it'd require me to learn something, so I'm going to shoehorn something I feel more comfortable with, even though it's not the best tool for the job."
Edit: I'm rate limited so to elaborate a bit.
Queueing technologies are not "new interesting bit of technology", they're tailored solutions to solve a specific problem.
Using a RDBMS for queueing is not what it was built to do, and you will run into issues doing so (I have).
By trying to use one tool for everything, you lose out on all kinds of optimizations, features, and performance enhancements that are specific to the problem you're trying to solve.
It's bad engineering to try and force Postgres into the role of queue when vastly superior technologies exist. You're actively hurting the engineers you work with, and the company you work for, if you force the same tech into use cases it isn't optimal for.
I cannot stress this enough; fear of learning is anathema to software, and trying to hide it behind a veneer of caution is not only disingenuous but potentially malicious as well, maximizing exclusively for the benefit of the individual against the interests of the group.
Edit: I'm rate limited so to elaborate a bit.
Queueing technologies are not "new interesting bit of technology", they're tailored solutions to solve a specific problem.
Using a RDBMS for queueing is not what it was built to do, and you will run into issues doing so (I have).
By trying to use one tool for everything, you lose out on all kinds of optimizations, features, and performance enhancements that are specific to the problem you're trying to solve.
It's bad engineering to try and force Postgres into the role of queue when vastly superior technologies exist. You're actively hurting the engineers you work with, and the company you work for, if you force the same tech into use cases it isn't optimal for.
I cannot stress this enough; fear of learning is anathema to software, and trying to hide it behind a veneer of caution is not only disingenuous but potentially malicious as well, maximizing exclusively for the benefit of the individual against the interests of the group.