Yep - DEFT-style 3:2 pulldown removal to convert a 60i film VT
edit to a 48i VT (which is then replayed at 50i) is the best ideal. (DEFT was the original Snell and Wilcox converter that removed 3:2) I wasn't saying it was unusual for shows to be shot film (or 24p video) and edited on tape - more that it was unusual for 3:2 pulled down 24p 60i transfers NOT to be DEFT transferred. However for some reason this isn't always done.
Examples of non DEFT 60i to 50i conversions include the BBC broadcast of season 1 of 24. The BBC weren't supplied with a DEFT 16:9 version - they got a straight 60i to 50i conversion - with all the motion artefacts this would generate. Similarly some of the Sky Star Trek;TNG stuff is not DEFTed - though this may be because some of the effects were done using 30p or 60i video rather than in 24p - so the 3:2 can't be fully unpicked.
Well I'm glad you've made that a little less confusing for us all.