Coffee can be pretty acidic. I’ve seen it etch stainless steel commuter mugs over time. I’ll pound the search engines to see if the leaching is a pH thing in addition to a temperature thing.
Agreed there are more aesthetic solutions than Mason jars and a mesh tea strainer. But I’ve broken so many of those borosilicate glass French press carafes (these are upwards of $20 to replace: grrrr) that I’ve all but abandoned use of them. Maybe those porcelain French presses are tougher but I’ve yet to see one in the wild, in use or in a shop window.
