For a quick example of an element and its evolution:
`”About Lesson” in lesson description:
2.0.1:
div.tutor-course-single-content-wraper div#tutor-single-entry-content.tutor-quiz-single-entry-wrap.sidebar-hidden div.tutor-course-spotlight-wrapper div.tutor-spotlight-tab.tutor-default-tab.tutor-course-details-tab div.tab-body div#tutor-course-spotlight-tab-1.tab-body-item.is-active div.tutor-fs-6.tutor-fw-medium.tutor-color-black
2.0.4:
div.tutor-course-single-content-wraper div#tutor-single-entry-content.tutor-quiz-single-entry-wrap.sidebar-hidden div.tutor-course-spotlight-wrapper div.tutor-tab.tutor-course-spotlight-tab div#tutor-course-spotlight-overview.tutor-tab-item.is-active div.tutor-container div.tutor-fs-5.tutor-fw-medium.tutor-color-black.tutor-mb-12
2.0.5:
div.tutor-course-single-content-wrapper div#tutor-single-entry-content.tutor-quiz-single-entry-wrap div.tutor-course-topic-single-body div.tutor-course-spotlight-wrapper div.tutor-tab.tutor-course-spotlight-tab div#tutor-course-spotlight-overview.tutor-tab-item.is-active div.tutor-container div.tutor-row.tutor-justify-center div.tutor-col-xl-8 div.tutor-fs-5.tutor-fw-medium.tutor-color-black.tutor-mb-12
Seemingly similar, yet different. And this is the first example. There are many such changes from version to version. Anyway, this applies not only to CSS classes and nesting of elements, but also other things.
In fact, after each update you have to review everything, whether it is really as it should be. Even WooCommerce does not require so much care for updates, because there even with major changes they take care of backward compatibility.