1) picking experience per box has changed. It may have gone unnoticed by most because it happened shortly after the amount of boxes available went up, but the experience per box has gone down by quite a significant amount. Rogues (I'm not sure whether it required 3x training and/or LM, those others interested enough to do the research as well as me all played 3x LM rogues) used to have a more advantageous curve than others, and this advantage has been removed. This has the effect of greatly reducing the reward for being really skilled at matching pick to lock. I used to be able to get 50-100% more experience per box on a LM rogue compared to a bard. Now its almost the same. All the new info, extra boxes and reduced RT made it too easy to script too much experience too fast, so it got nerfed?

Its harder to tell for traps, but I'm fairly sure rogues had the same advantage on the curve for trap experience in the past, and its only locks where the advantage was removed.

I'm not sure if Ildran put in in place or not, but an advantage for smiths was part of the discussion when Ildran reviewed experience a dozen or so years ago so its something that I expected to be there when I found it, and didn't expect to find had been quietly removed.

2) Calipers are a lot less accurate for simple locks than really complicated ones. e.g. Reim locks (200-400) have double to triple the caliper error that Nelemar and Plane 4 locks do. It doesn't seem to go all the way down to primitive locks, but there's a midrange where the error is huge compared to the most difficult locks.

I think this was a side-effect of the caliper and trap component changes that were announced half a dozen or so years ago and then quietly reverted a couple years later, but it may have been always there and paying more attention while adjusting to the caliper changes caused me to notice it for the first time. Its also possible that its not so drastic when your maxlock is 900 rather than 1500 and so it was capping that started to generate my WTF moments with calipers on midrange locks.

Calibration is the one RT that always annoyed me and its doubly annoying that it didn't get reduced most other RT did, as midrange locks require calibration on every measurement as well as repeat measurements because the error gets so large so fast the moment they go out of calibration.