What do you mean by scrollbar? Xterm has a scrollbar, and you can customize it with plenty of options.

Tabs I agree that it may be a showstopper for some, however in X you can use suckless tabbed to add support:

https://tools.suckless.org/tabbed/

For some of us, we just want the fastest terminal out there (in latency and startup), because everything else will be taken care by the window manager or Tmux.