Seconded. Though curl isn't the worst offender in that regard. Anything that touches TeX drives me nuts with its blatant disregard for this rule. Not only does

Seconded. Though curl isn't the worst offender in that regard. Anything that touches TeX drives me nuts with its blatant disregard for this rule. Not only does every TeX engine spew pages of output while processing even the simplest documents, but there is no way to turn it off. (It's hardly the only way in which TeX makes my blood boil, but it's the most visible one.) FFmpeg is also quite bad here, but at least you can use -hide_banner and/or -loglevel to alias the problem away and mostly forget about it.