The old TV used as a reference is from the end of the 60’s, slot mask began to take off in the 70’s. Dot shadow mask was used at least used in TVs throughout the decade. I was earlier inquiring about lowest TVL with that mask here. Although I had monitors in mind because I thought TVs with the design had become obsolete before gaming was a thing, hunterk pointed out that Zenith did continue development based on that mask design in the 70’s. I find this quite interesting now, because it’s not clear when low-TVL sets with masks like that ceased entirely to exist.
There’s a couple of interesting articles in the US Popular Science mag regarding TV (mask) developments from that time.
E.g. here, Nov. 1973 issue:
Who’s using the slot-mask tubes? They’re so new only a small percentage of the '74 models have them. RCA uses their tube, the AccuLine, in some 15-, 17-, and 19-inch all- solid-state models. Magnavox, re- vamping their entire line, puts RCA’s tube in 17- and 19-inch 100-percent solid-state models. Sears, Admiral, G.E., Teledyne Packard Bell, Sharp, and Toshiba also use slot-mask tubes
The page after that describes a test comparing new high voltage tubes with the other designs:
Zenith has boosted 17-, 19-, 23-, and 25-inch- set chassis by several thousand volts. Other set makers have increased the voltage on some models, too.
How do the new high-voltage tubes compare with the slot-masks in picture quality? It’s a standoff. The
Zenith (high- voltage) and RCA (slot-mask) 17-inchers I’ve been testing produce crisp, equally bright pictures. Zenith’s boosted-voltage 19- inch Chromacolor set compares equally with Magnavox’s 19-inch slot-mask receiver.
Tops in picture quality was the 17-inch Sony (model 1722) I also tested. Its slim cabinet houses a 114-degree Trinitron tube. ( Most pic- ture tubes flare 90 degrees from their necks.) Sony’s single-lens focusing of in-line beams and the flatter tube, which reduces electron-beam diver- gence, provide amazingly sharp im- ages.
So, videogaming was clearly a thing with these when it took off, but normally, you’d likely only have a RF connection. 
