Not being able to scroll was a pain, but nothing that tmux or even output piped to less couldn't solve. It wasn't glorious, but it worked. That said, might be tempted to try ET just because scrolling through long winded outputs are a frequent thing.
Smooth-scrolling back through a command that unexpectedly dumped 500 lines of output, using Alacritty and a big scrolling trackball with acceleration, is pretty glorious.
