Late response but still a response:
Didn't find a single bug or weird thing but it simply didn't change much for the programming of my game (didn't harm either, so that's great!).
The problems arise when you are doing things like this:
Even if I can write half the word and then select the ending, it would soon become ineffective because I want each combination of CC/CW, left/right/up/down, lever1/lever2/pivot1/pivot2/balast1/balast2 (that's 48 objects in total).
Essentially, I end up writing the whole thing.
It's notable that, very often in programming languages you use a dot as a separator for subparts and subfuctions and other scope limiting factors and the autocomplete only works until the next dot.
Minecraft has in-game commands that would also experience this problem but they've made the autocomplete work until the next branch instead (where "branch" means that 2 words have this same maximal prefix) while also listing the suffixes that are still available, it saves a lot of typing as it should.
My example is a bit extreme and you usually wouldn't need things like this but simply splitting Object into Object1 and Object2 makes the autocomplete much harder to use.
I don't know if this is something to care about or not as I find it completely fine without autocomplete in the first place and, since it doesn't seem to do any harm, it's the same deal as before in such exotic cases.