I have (6) 45-70's (no .444's) and have shot them for many years. Only two are Marlins and I've never blown one up. I don't intend to do so.
The .45-70 Marlin isn't quite as strong as the .444 Marlin, due to the design issues already covered.
Just something to keep in mind. Not a reason to chunk the .45-70's and load up on .444's...
DF