To be fair, they didn't work for so long that I have pretty much stopped reading journals. If it was restored within the last few months, I probably haven't noticed yet.
Journal comment notifications are definitely working for me, though you might have to enable them manually in your notification settings (I don't remember if I did that or not).
I think the problem is that many IOTD's don't invite much conversation beyond "well done", "nice", etc.. as they are often just screenshots of full games at various stages of development (which is fine, by the way). I find the most active IOTD's are the proof-of-concept ones where people can comment by asking questions about the tech (which might also give rise to an interesting forum thread later on).
But there's definitely also a lack of members checking out the IOTD's - I find the number of guests commenting is very disproportionate to the number of members commenting, which shows that either:
- IOTD's have very good google coverage
- members aren't made aware of them or are not interested
One reason I can think of is that the "view gallery" link is not very explicit (at first I thought it linked to a list of pictures of the current IOTD) and is rather awkwardly placed next to the IOTD's name (and often gets split on two lines). An "all IOTD's" link next to the "submit your image" one would be more consistent, in my opinion.
The consequence of this is that past IOTD's are difficult to browse if you don't know where to look for, and since IOTD's only last featured for a day or so, members can miss out on them pretty easily. Add to that the lack of comment notifications, and it really doesn't make conversation easy.