yanrair, # 107
You appear to have overlooked the main point; perhaps the explanation of the difference between balance and absolute force lacked clarity (# 105
737 Stuck Manual Trim Technique).
All aircraft are in balance, irrespective of size or power controls (a simplistic analogous description of a beam balance *). If a system is disturbed or breaks, the ‘twang’ of the more heavily loaded (force not weight) tends to be more difficult to restore.
You similarly overlook the argument that as the aircraft variants have developed, the time available to recognise and act with trim runaway may have reduced. If so, there are situations where it is unreasonable to expect the crew to achieve the performance required for the severity of outcome. The safety margin is in knowing how and when the situation is sufficiently understood to act.
Aviation should not bet on anything, nor shrink behind terms such as basic skill, knowledge, or airmanship without explanation of what these entail and the context in which they are being used. The misuse of these or the assumptions in them - that every pilot will have the same understanding and ability to act, may well be at the root of the Boeing trim problem.
*
https://dictionary.cambridge.org/dic...h/beam-balance NB aerodynamic notes.
P.S. instead of quoting lengthy posts in full, select the relevant section, or link the post as a reference under its # designation. How to do that: - knowledge, basic skill.