Thank you very much for your answer to my question. I understand fully the USPS current concerns & actions regarding the "bottom line;" each day when I watch a lone Postal Clerk working @ the one window open when the other is not occupied. It is a business & I also am suspicious that someone may have also decided to reduce the cost of issuance, by simply omitting the information in addition to the reasons you mention. Times change & those require measures to adjust & I realise those are a part of the business world. it is hardly unique to the USPS, it is just an unfortunate result.
I just found another commemorative stamp I have enjoyed using, no longer available & in fact one of the stamps listed for "official destruction" in late 2016, available for sale on Ebay & was happy to purchase them. I realise I may be the only person who notices the postage I use; it is still a pleasure for me to consider different stamps for use on envelope.
I grew up with my Parent's use of stamps in coil, but also a leather box, with unused other stamps (perhaps older stamps & some used for additional postage requirements) & was always fascinated by them. It is such a simple act, yet if one spends the time to choose inks & paper, also a logical consideration. I presume the sale of same is also "good for the bottom line," of the USPS or they wouldn't issue them. I hope it will continue to be so.