"You'd think Mac would have a screen stand that could be adjusted for height." They did, it was nicknamed the iGloo.
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It also swiveled left/right. Have used a Rain rotating base ever since then.
Modern, high res monitors, even 21" ones are much heavier than that cute thing. I don't know of anyone making a vertically adjustable, all in one computer. The only way I know to do that is with a special desk top, with a section that can move up/down or with an expensive wall mount.
High "Resolution" monitors, at least those used with macOS, base text on points not pixels, so palettes, properly constructed, don't shrink. Who knows how Adobe does things.
Their latest version of PSE (
2018) is still not 64 bits.