I'd argue the tech industry provides enough good opportunities that its worth going for better quality of life from WFH and 4 day weeks without worrying what one loses by not being in the office every day. The more people that do WFH or 4 days, the less anyone is hurt if not physically there every day, so this opportunity cost diminishes. So we should encourage our coworkers to do the same :). Also consider that you might perform more impressively in your work if you've had lower stress from WFH/4 days, and that could get noticed too by your boss.