I guess we have tended to go for relatively polished high school hitters. Crawford, Miller, and Nori are all high floor guys for HS players. Burkholder is more risky (though enabled by the under slot high floor pick in Nori).
The biggest change in our system rankings is we really have stopped spending much money on pitching. Hitters are less risky in general at whatever age they are acquired. Pitchers get hurt.
I think any big organizational shift has been towards developing more toolsy hitters (so they have defensive value) over spending money on pitching. The consequence is we'll have to spend more free agent dollars on pitchers than on hitters.
It is really hard to say that we are better than 5 years ago or there is some grand strategy that has improved our rankings. We probably are a little smarter analytically because Klentak was flailing there for a bit. When rankings depend so much on the speed of graduation then small things might look like trends but really aren't. Heck, just by drafting more HS number ones we probably improve our system ranking versus college number ones over time simply because the HS players spend 2+ more years in the system on average. Guys like Bohm and Nola who blow through the system only get ranked in the top 100 once or twice.