Remember, most suppliers are merely retailers. The true responsibility lies with the buyers of Rimmers, Moss, Fitchetts, Paddocks, Ang, Sc etc to refuse to sell products that are not fit for purpose.
Sometimes we are our own worst enemy, demanding "cheap" parts - if we shout too loud for this ... this is what we get. And if we shun quality reproduction parts because they are too expensive then the market contracts to only include those that have little interest in ensuring accurate tolerances & durable materials / construction.
When we can again gather for trade shows - perhaps the club could host a forum / Q&A with the above Co's buyers ( not sales reps ) so Quality Control & Reliability can be discussed. With the number of our cars still on the road, collective action must surely have a chance of bringing some market forces to bare!