I think, the visitor will never tap two times, when he does not know, how important these pages are.
Yep, but the same goes for desktop users too. They may just as well skip your section index pages and directly load some of the products pages. So maybe you should reconsider if it’s OK for you to place very important information the users absolutely must see on those index pages and at the same time use dropdowns that provide the possibility to skip them. There are different approaches to solve the potential issue:
– do not include very important information on the section index pages but instead show it on all products pages (I would probably choose this – normally index pages contain just a list of all the child pages)
– do not show the products pages in the dropdowns so that users always need to pass through the index pages and read any important information there
– some other possibilities like mega dropdowns where the index pages are presented by headers and can be loaded on the first tap (but again, this doesn’t solve the issue that they can still be skipped)…