Hello everybody,
I recently installed J4 beta7 and here I'd like to share my experience of using J4 admin template and problems I met.

I understand that the template is designed to meet the expectations of mobile/gadget users. But they are consumers of the ready site when all is done and you can manage articles.
Let's have a look at the process from another side: of a webmaster.

I am using the wide monitor and love to work in big resolution.

QUICK ACCESS
Well, in fact, there is no too big need in top menu, but its big advantage was a matter of habit and grouped items when you can quickly find what you need. For instance, I want to install extension.
In J3 I go to Extensions > Install extension.

You can say that dropdown menu is obsolete, but using it I see only related items and quickly go to the menu item I need.

Let's see J4 when we go to the System menu.

The menu items are structured, but the list is a HUGE! Each time I need to quickly read numerous names to find what I need until it won't became a habit. But the brain analyses the information and you spend more seconds.
So, there are too many menu items and when I making a new site, I need quickly go to Plugins.

The best solution I could find now is to add a custom menu to the sidebar. Here is it:

Using such approach I do not need to waste time on examining the huge list of items on System page.

CREATE MENU ITEMS
here is how it looks like:

It's a loooong distance from Selectbox and to the elements:
I click on Select button, then modal window appear, I have to move button to the left to select component, then to the right to click on Select again and select category, then move to the left to the toolbar to save the changes.

Too many moves need to be performed on big resolution screen.
And see how it's simple on J3:

All is near one area (to the left), the selectbox is not too large. It's comfortable to make a few moves by mouse in a short distance. It keeps time which absolutely matters when you create sites and there is a fight for each second!

Let's make something like that:

Yep, there is an empty space in the middle of the screen, but this is a backend template and we should think about a comfortable work on any resolution for each person!

TOOLBAR
I need to make an extra click on opening a dropdown list with toolbar items.

it's ok for gadgets or laptops, but it needs to perform extra action on the widescreen.
It's possible to check screen resolution and display a list of items without dropbox on wide screens.

How it could be user-friendly just to see a horizontal list of action buttons!
And it's shouldn't be too hard to implement it, I hope. let it be dropdown list as now on other devices.

FILTERS

Compare:

EDIT ARTICLE

Please make black arrow on green background as a white arrow.

As we can see - filters are under the items list. It needs to do the minimal move for the mouse to access what we need.
The same is expected in the new admin template.
Just align filters to the left side under the list of items.

That's all for now. I hope these thoughts can help to make admin template better.
Thanks for your attention.