CRTs had been around for a long time but to display computer graphics people used storage tube displays.
Nonsense.
Most of the CRTs used on computers are normal CRTs, and early (70s) computers used the same video monitors as video studios or converted TVs, or TVs with RF modulators (This was also pre-videogame and pre VCR, so the average TV did not have a direct video input.)
A fair number of the actual "computer monitors" had high-persistence phosphors, enabling them to use higher resolutions at the same sort of horizontal scan frequencies and dot-rates that were implementable, but that is not at all the same thing as a "storage tube."
There were also "vector" displays that permitted the electron beam to be moved by separate X and Y values rather than the usual raster-based display. These were good for graphics (and also usually mixed with high-persistence phosphors.)
The only "storage tube" terminal I'm familiar with were the Tektronics 40xx graphics terminals, which were early high-res graphics terminals (also vector-based, IIIRC)
(Hmm. There were also the PLATO displays, which were dot-matrix plasma displays. ~1972 (!))
Monitors were horribly expensive, even compared with other computer components, for quite a long time. I think the original IBM PC Monitor/MGA card combo (a high-persistence phosphor) was close to $1000, as was a 14" color CRT in the Mac-IIci timeframe (1990) The advent of cheap PC clones and the "Hercules Graphics Adapter" in the mid-1980s resulted in major improvements in price to small monochrome monitors, but it was quite a while before color monitors came down in price.
I've actually used numerous ancient computer "terminals" ranging from Hazeltine-2000s to ADM-3s to (real) VT-100s, plus a bunch of others, including a kit-built terminal that displayed on a 9inch surplus Airline reservation video monitor. Also A Vector General 4096x4096 vector display, IBM MGA and CGA adapters with genuine IBM monitors. Assorted display boards for the S100 bus, an Alto, assorted early SUN workstations, and a SAIL "Datadisk" terminal. Also a Tek 4010 graphics display with a storage tube - the ONLY ONE of the bunch with a storage tube... All in the ~1975-current timeframe.
Flat screens are great. I bought my first (14"?) when they dropped down to about $300, and they were worth every penny for the space they saved. The 20inch color CRT at work got replaced with a 24inch dell flatscreen, and I got back an enormous amount of desk space, and no long needed help to move the monitor (exaggeration, but not much of one!)