LMDE4: How Much Does Debian Matter?

Linux Mint Debian 4, or LMDE4, is now available. Does it really matter whether you run this latest Linux Mint release, based on Debian Linux, instead of Linux Mint 19.3, based on Ubuntu Linux? The answer depends on two things. One is your personal computing philosophy regarding refresh cycles and leading-edge technologies. The other is what you want in terms of a computing experience — such as new features, reliability, performance and style. Also consider a related question: How does LMDE4 compare to running pure Debian Linux?