What is the reason for canceling lv_cont and lv_page, it is more difficult to upgrade the project from 7.7 to 8.0 ？
In v7 the main feature oflv_cont was to provide layouts. However, in v8 any object can have layouts so lv_cont became pointless.
Similarly, lv_page was to provide a scrollable container but in v8 any object can be scrolled.