I have found them invaluable in correcting things when others disassemble families in my line
I believe it was Ron Tanner who originally indicated that plans were in the works for us to be able to print a completed temple ordinance card for our own records and that it would contain the data for that person at the time the person had their ordinances reserved. It has been a while since that was expressed, so I don't know where FamilySearch is in providing that ability, or if it is still a future feature to be developed or perhaps shelved.
i don't think people are understanding some of the concerns with regards to checking if ordinances are done correctly.
If I bring 20 cards to the temple, and then get home and check for a notification of ordinances being completed, and I see that only 19 were done, how do I know which one was not done? The temple shredded the cards and I have a couple of hundred ordinances reserved.
It means I now have to create a seperate record of every ordinance at the time that I bring it to the temple and then double check it later. So I either take pictures of my ordinance cards or write them out manually. Both of these options are quite silly.
And shredding cards does not do anything to prevent people from duplicating ordinances. I can print out a card and leave it sitting on my desk for 10 years and it will still work at the temple. Whether it sits in a temple drawer after an ordinance, or on my desk makes no difference.