In summary, it turned out to be a great trip. My thanks to GP who was a fantastic traveling companion. I have this vision of him dragging me up some of the steeper trails. We had a lot of laughs (and a few beers after the hikes).
We were lucky. No injuries, turned ankles or health issues. No transportation problems. Also, the weather was incredibly good for the middle of September. There was only one day of rain and another day of fog and low clouds. The day it rained, I took a side trip to Interlaken (where it was sunny) and spent a couple of hours hiking around that village. The other day with fog and low clouds, I traveled to Gimmelwald and took the hike to the Sefinen Valley and Kilchbalm.
Besides the hikes described above, I repeated some of the intermediate-level hikes that I had taken on my prior trips to the Berner Oberland. All of the 8 hikes (described above) were significantly more difficult, but they took less than four hours to complete (at a steady moderate pace). The most difficult hike for me was The Eiger Trail, but it was also the most enjoyable and satisfying hike.
I continue to believe that the Berner Oberland is the premier hiking destination in the world for hikers of all levels. The mountains are stunning. I find each of the villages in the BO to be unique and quite interesting: Murren, Wengen, Gimmelwald, Lauterbrunnen, Grindelwald, Kandersteg, Stechelberg, Interlaken, etc. On this trip, I discovered a new region around Grosse Scheidegg that I had never hiked before. Now it's one of my favorites, and I hope to return many times.
I have three suggestions for anyone visiting the Berner Oberland. First, try to take a couple of the easier (but great) hikes like (1) Mannlichen to Kleine Scheidegg, (2) Grutschalp to Murren (or the reverse), or (3) the hike to Oescheninsee (from the top of the Kandersteg lift to the lake and return). These hikes can be completed in less than an hour and a half -- and they can be done in tennis shoes without hiking poles. Second, do your homework and be prepared for rain or bad weather -- and take plenty of water and some snacks. Third, start off with the easier hikes and then try one or more of the more challenging hikes (like the Schynige Platte circle hike (on the wanderweg), or the hike from First to Bachsee, or Grosse Scheidegg to First).
I have a list of the 12 easy-to-intermediate hikes that I had taken on my prior trips to the Berner Oberland, and a list of the 17 more difficult hikes that constituted my wish list for this trip in September 2019. If anyone is interested, I would be glad to share the two lists.
The mountains are calling, and I must go.