PR drops are definitely fun! You can make them easily with a torch, some glass and a bow of water. The problem with chips in a lid is that they will slowly exp

PR drops are definitely fun! You can make them easily with a torch, some glass and a bow of water. The problem with chips in a lid is that they will slowly expand over time, likely leaving debris in food. It can also lead to sudden unexpected failure as glass gets much weaker once chipped or scored, especially combined with moisture. I don’t discard lids immediately either, but the manufacturers do suggest it for those reasons. Definitely not like tempered glass, you’re right! Tempered glass is safer in how it break into those little square pieces - much less likely to lacerate than long jagged shards, in many applications (shower doors for instance). I had a tempered safety glass oven door shatter suddenly one day - apparently this happens fairly often?