Now of course, digital scopes now have LCD displays which use much less power and are (immensely) more compact than the CRT tubes.
The funny thing - in regard to for example, TV sets - is that in the "old days", we had to wait for the CRT tube heaters to come up to temperature.
You would think that digital ones were now "instant on", but in fact, you still have to wait while they do their self-check - and then load Windoze - or something.