No, a small script appears in yellow in the top left, but no prompt or power button requirement.My rooted Samsung A505F used to show a warning at boot splash that this device is using a custom rom, press power button to continue, then i found a fix at xda to go back to normal screen.
My T825 didn't notice.
What do you mean with the pwr button?
No, a small script appears in yellow in the top left, but no prompt or power button requirement.
My tab s6 cycles through the screens you mention, however if you ignore the first, ie,not press the power button, after a pause on the first screen, it will still proceed to the boot screen in any case