you do realise. that to achieve high majority.. (to even trigger the grace) is not going to happen in 2 days or a week. it can take months and months for "Businesses to successfully develop, test and deploy". (before a majority is achieved.

once high majority have "successfully developed, tested and deployed" then there is still some extra time added after that point for the 'lazy/laggers' to have some time.
this EXTRA time is called the grace period.

EG 5200 nodes... taking XXmonths to get 95% majority after they developed tested and deployed to then show their desire.
leaving 260 nodes not yet ready.
the grace period is then for those 260 to finish off their tests or just download the already coded releases others have already deployed.

here is the kicker.. them 260 nodes.. did you cry doomsday when node count went from ~6000->~5740 couple years ago. did you even care to ask why those 260 were no longer running. what about when it went from 5500 to the current ~5200 are you crying blue murder right now that businesses are failing and cant use bitcoin..

my point being
if you think that businesses are going to just sit on their hands for months and months and only start programming after the grace starts. then you have not understood why people want to be full validating node in the first place. (im laughing at your "behavioral analysis." claims)

those "businesses" will be the first to get a release running BEFORE the grace. infact they already are and have..
because it actually means something critical to them. the last 5% are usually people that dont critically need or care to be a full node, or are intentionally not doing anything as some form of protest