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I suspect it's a combination of price, market demand, and the shift away from customer serviceability.
Was it markedly more expensive for features that most buyers didn't have a lot of utility for? I'm just getting started on the CTM functionality. Not exactly a frequency counter, not exactly a multimeter. I can see it being perceived as an unnecessary extravagance at the time. I have no knowledge of the price differences between these 2200 series models at the time. I'm personally enjoying it, but I'm hardly typical.
Was the service manual an on request thing, that also possibly/probably cost extra? The front page of the 2236 service manual starts with "Warning Following ... for qualified personnel only ...". Nothing of the sort in the 465 manual. Don't know if the 465s came with the service manual or if it was an on request thing.
I was a 400 series user in the 80's, but never a Tek customer (Army). So all above is just wonderings and supposition on my part. I can't say I'm terribly surprised.
The seller responded through eBay and is looking into the viability of making a hard copy. In the meantime I'm muddling along with the online PDFs. Thank goodness for those who've made these available.
Dave