Atari 2600, NES, SNES, and Genesis. Just put in the cartridge and start playing. The best startup sequence is not to have one at all.
The whole startup sequence thing started when disks came around. They have slower load times, so they needed to give us an entertaining startup sequence, so that we didn't realize that we were actually waiting through boring load times.
curl-6 bet me that PS5 + X|S sales would reach 56m before year end 2023 and he was right.
My Bet With curl-6
My Threads:
Master Thread, Game of the Year/Decade
Switch Will Be #1 All Time
Zelda Will Outsell Mario (Achieved)
How Much Will MH Rise sell?
My Bet With Metallox