Not maybe informed, but definitely different experience. My first Marlin lever center fire was a 444. It was quite plain. I couldn't shoot cast bullets in it unless they were nearly inside the case. I shoot cast bullets a lot and cast bullets in a 444 would make sense, but not in that Marlin. Next Marlin was a 30-30 the cross pin that held the tube in place would bend until the tube would slide out. Later I found parts from a later Marlin that had a larger cross pin. That rifle is plain also.
To me Marlin JM's are a cheap cheap rifle. Granted they improved over the years, but I have not wanted to spend my jingle on them. I have an Model 64 30-30 and a Model 94 32 Special, both Winchesters. I like both. I still have a Marlin 30-30 but it's ugly in my eyes.
