Can't disagree with most of what you've said. Initially GB had a target of 54-92 medals which was subsequently reduced to 45-70 due to the difficulties and uncertainties caused by the pandemic. Personally I was expecting a tally in the low 50s while secretly hoping for something in the high 50s so 65 exceeded my expectations and comfortably met UK Sport's target. Indeed but for the Covid forced withdrawal of Amber Hill and injuries to one or two key athletes like KJT they might easily have surpassed Rio which would have been a remarkable achievement and worthy of a 10/10 score.
Sports like boxing (+3), equestrian (+2), modern pentathlon (+2), sailing (+2) which have always been reliable contributors to GB medal hauls stood tall, while swimming (+2) has proven a growing area of strength. Cycling, diving, taekwondo and triathlon also continued with their solid contributions which was particularly satisfying in the case of the former as there were concerns about a drop off in success on two wheels. Growth in MTB and both BMX racing and freestyle helped to prevent that.
The three sports that saw significant falls were rowing (-3), canoeing (-2) and gymnastics (-4). Rowing had internal problems and there were suggestions that their high altitude training had gone wrong. It was also a hugely inexperienced squad with 80% newcomers. Margins are small and if they had turned some of their six fourth places into medals they would not be facing the level of criticism they have received. Most of GB's success in canoeing has come from slalom and in Tokyo I don't believe they had their strongest men's team. The selection process used saw the elimination of then reigning Olympic champion Joe Clarke and multiple medallist David Florence both of whom would I believe have strengthened the team.
Gymnastics is an increasingly competitive sport as we see the spread of medals among different countries increase every cycle. The question facing some countries is do we concentrate on winning team or individual apparatus medals. The strongest can do both while the less strong probably aren't going to challenge for team medals anyway and should target individual apparatus. I think GB managed to fall between the two choices leaving question marks about their selections. I may be wrong but I believe they are returning to five member teams in 2024 so that should help solve some of the selection quandries.
GB performed at about par in athletics with six medals although we missed out on gold for the first time since Atlanta. On the downside were the injuries to KJT, DAS and Gemili. One of my biggest frustrations in sport are the apparently never ending injuries and niggles to British track & field athletes. On the upside is the revival of British middle distance running with medals in both men's and women's 1500m and women's 800m. The saddest story of this cycle from a British perspective has been the decline of the men's 400m flat and hurdles, two events in which the country has a rich history and which also applies by extension to the 4x400m relay. More support in this area and in field events should be a priority for UK Athletics.
Anyway overall it's been a great games with some outstanding performances from athletes not only of GB but of many nations who have had to overcome incredibly difficult preparations. Well done Japan and well done to all the officials and helpers for delivering something to remember and lift the spirits after the traumas of the past two years.