This makes a lot of sense to me. I knew nothing of this tea drinking world before a couple of months ago. My ex-girlfriend is from Japan, and she is the one who got me into drinking loose leaf green tea years ago. She never purchased the gourmet tea, though. She would return from her visits to Japan with bags of tea brands you find in Asian grocery stores (Itoen, Yamamotoyama, etc.). She did have a kyusu, but we never brewed the kind of leaf to water ratios I'm learning about now, but it really makes perfect sense to me. This "world" reminds me of going to the wine tastings upstate in wine country every year. We would really enjoy these small portions of wine coupled with some food the wineries spread out on the counters. We would swish the wine in our mouths and taste the fruity notes. The tastings were fun, but never meant for long drinking sessions. Then, at home, my girlfriend might enjoy a large glass of red wine with her dinner (I was never much into the wines, but I did enjoy the wine tastings).
I can appreciate what, and how much you drink is dictated on your mood and the moment. When I was working today (from home), I enjoyed four infusions of sencha in a 9 oz. cup, with only 5.32 grams of tea leaf. I like knowing I can control the strength of the tea, depending on what I desire at the moment. That worked for me earlier today. Now, however, I am drinking another sencha in a small, porcelain cup. 130ml of water to 6.5 grams of tea this time. I borrowed that ratio from Akira Hojo, in a video I found on YouTube. He suggested the tea leaf should be 5% the volume of the kyusu. I have a large 360ml kyusu, so I used 5% of the volume of water instead, which was 130ml.
This is a new way for me to drink tea. I do like it; however, I think the grassy, vegetal notes I identified earlier were muted (maybe even lost) with the higher leaf to water ratio. I would have to play around with it and pull it back a bit to see if a little less leaf might work better for me.
I think there is a time to sip and savor your tea, and a time to drink a large mug if you so desire, but no doubt the leaf to water ration will change depending on how you are drinking.