When I need a terminal, mod+enter spawn one and close it. I'll often do this to download a file, start yt-dlp, mpv etc. The session is all tmux so I never keep the window around when not in use.
Me too. On my systems, running Debian with dwm, a Kitty terminal appears instantly. It’s the fastest terminal I’ve ever used, by a big margin, including xterm. The fact that I can do things such as ssh into a remote machine and see an image in that machine’s filesystem displayed in the terminal are bonuses. I mainly use it because of its speed and Unicode support.
Sure, if that's your workflow then I get it. I and many others keep around several persistent windows or tabs however. I don't care if Alacritty takes 1s to start.
Still doesn't invalidate its usefulness, too. Alacritty in particular is often times a better Unicode-rendering citizen compared to other terminals.