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Dear community,

KDE Plasma is certainly one of the most beautiful desktop environments existing. For me there is, however, one significant flaw. In every program there is this title bar at the top which takes up space unnecessarily and breaks with the design of the application. It is possible to hide it in the context menu by checking "no border" but then minimize, maximize, close and pin buttons are removed as well, which breaks with the normal habit of handling windows.
Can the buttons not be integrated in the application similarly like in Windows? To see what I mean, here some images (or rather URLs since imgur images cannot be inserted apparently):

KDE, Firefox, titlebar takes up place
https://imgur.com/4Oy0aG9

KDE, Firefox, titlebar takes up place and breaks with the theme
https://imgur.com/ihNyboL

KDE, Firefox, "no border" checked, buttons like close etc. missing
https://imgur.com/mN59D1i

KDE, Telegram, titlebar breaks with the minimalistic design of the application
https://imgur.com/HI1xhWp

Windows, Firefox, no such breaks, all buttons are integrated, looking much more natural
https://imgur.com/NVq1N6y

Greetings
CS

Some time ago I suggested to remove entire window decoration and show little panel, when mouse move on top of a window (for example there can exist 5px invisible frame). When user move mouse on top of window, panel is displayed. Left click dismiss panel and right show window menu. Additionally, we can make some keyboard key makes to do not display this frame, when mouse moving,

My idea was lost on this brainstorm.

There are themes that offer all sorts of decoration variants, also a number without title but with buttons.

Sounds good but which one would that be for example? I did not find any.
And why not make it this way by default?