@Ondřej-Šutera I would like to chime in here and express my view that this is a poor decision. I understand the desire to have a larger gallery-style UI and where it can benefit, but for other specific users (such as your power users like pilots or skippers) minimizing confusion and interaction time is paramount. Other users might have an older device (like myself with an iPhone SE Gen2 - so iPhone 7/8 screen) that just doesn't have the display real estate for the interface in its new proportions.
I understand not wanting to fully support both the old and new UI as you develop further features, but I strongly suggest you consider possible alternative solutions.
Perhaps there could be a toggle in settings to turn off the large "metro" design language style tiles, and use icons that are a portion of the size of the tile (e.g. half)? All the tiles seem to have unique icons already, so just use that icon (but larger and easier to identify) and then you can fit more icons in a row (potentially 6 instead of three in the screenshots from @przemo1986 ).
That alone, when combined with the existing pin feature, would immediately resolve many of the concerns that have been expressed here.