As stated in this feature request, we work agile and the tester gets new applications versions (almost) on a daily basis.
The tester does not know which objects have been changed/deleted. And does ...
Montikore As discussed here, it all depends on the chosen approach of software development and releasing of updates.
When using CI/ CD (Continues Integration/ Continues Development) the focus of test automation is on getting the bugs out of the software, driven by fast feedbacks on the testruns. Comparison to previous builds is not done, there is no time for that.
You can still trust your test results! But you have to keep in mind that testing is all done of the latest release and your findings have limited lifespan. Next day new software is delivered and you have to re-execute all the tests.
That's why you need to automate as much as possible (to keep up the speed), but use extensive scripting as little as possible.