Bleh, that attitude ruins merch. If all you care about is maximizing the number of walking billboards then you're satisfied because it's impossible to calculate the ROI of making available designs that people actually want to wear in public but reduces walking billboards.

The only tech merch I've ever worn was back when firefox had a good logo, goodwill, and no text on the front of the shirt.

Lots of people just want a simple graphic tee and IFKYK. It's not sports. Bands can sometimes get exceptions, but often approach wrestling tshirt levels of gaudiness.