Ok, so I tried out Axe and did some preliminary tests. I corrected some issues.
Among the returned results, there are also the following:
Document has multiple elements referenced with ARIA with the same id attribute: mobile-menu
.mobile-header-navigation.has-branding.has-sticky-branding:nth-child(5) > .inside-navigation.grid-container.grid-parent > .main-nav
Document has multiple elements referenced with ARIA with the same id attribute: primary-menu
nav:nth-child(7) > .inside-navigation.grid-container.grid-parent > .main-nav
Document has multiple static elements with the same id attribute
.mobile-header-navigation.has-branding.has-sticky-branding:nth-child(5) > .inside-navigation.grid-container.grid-parent > .main-nav > .sf-menu.menu > .menu-item-596.menu-item-has-children.menu-item-type-custom > .sub-menu > .menu-item-426.menu-item-has-children.menu-item-type-custom > .sub-menu > .menu-item-226.menu-item-type-post_type.menu-item-object-page
Does the theme allow to correct them or we should rather wait for subsequent theme updates (will such issues be addressed at all)?