Huh. Were they anywhere that pixel perfection was necessary such as games, or required constant browser universal testing for compliance, accessibility, being required to support cross platform?

Have any of your places used a service such as Saucelabs or Browserstack or rolled their own similar inhouse, or seen such as https://percy.io/how-it-works (random example; not affiliated or recommending this)?

I am hope I was not being too rude about it, not my intent, mostly surprising to me because a service like Browserstack is a decade and a half old already and the concept predates that.

I was wrong & you called me out on it, not rude, all good.

My first software job out of college was actually a QA Automation / SDET position, wrote an automated framework with Ruby + Selenium + Browserstack which did take screenshots of the app, but the app loaded dynamic content and there were frequent feature adjustments so no two screenshots were ever identical.

All other jobs I've had since then have been writing smart contracts for Ethereum apps - 100% backend, (I hate having to deal with frontend) so all our tests were just units & coverage & what have you.

I suppose if your environment holds constant and your features don't change frontend structure or behavior (eg refactors), then this is what you should expect.

Though, do note that this only works because my app is based on a tick/game-loop system without callbacks; if this was the standard game-development pattern of callbacks & message handling (especially w/ React / JS) to invoke events, it wouldn't work, because the timing would be slightly different each time, and an enemy would be a few pixels to the left/right of its position in the past run.