In a Ryan Holiday YouTube video on journaling, he suggests a physical journal on the basis that in the future it will be available, whereas digital copies may not be. One of the reasons I like Obsidian is that it creates text files. They are unlikely to be unavailable in the future. Like physical books, a physical journal might not be at hand when you need or want it. A physical journal would not be searchable. In my career, I observed many colleagues using physical journals to record all manner of information they had gathered and thoughts on the information that had occurred that day. Then some days and weeks got overwhelming and many items got pushed so far back that they were lost. I was using this method for a while, but switched to a digital method as soon as an appropriate one was available.