I know.. I have both read and taken part in that thread but again....
The majority of peopole who run Logic 9.1.8 and Lion or now Mountain Lion do not have those issues... and because they do not, they don't post in such threads.. so you get a distorted view of the true numbers of people with problems.
Those that do have issues, will naturally post up in such threads... but that doesn't mean they are the majority of users... They are just the 'loudest' and quite rightly so.
I will also say that for me personally, 10.6.8 and Logic 9.1.5/9.1.6 was and still is the most stable platform for Logic of all of the various combinations available... but apart from an annoying issue with the "airplay' dialog box that keeps popping up in 9.1.8 with ML... and the GUI lag affecting a few plugins.. I don't have any major issues with Logic and ML... so I can happily live and work with that setup...
Finally, it's also worth noting that with my own client base.. initially with Lion and then Mountain Lion the number of clients who had problems was much higher.. Probably closer to 20-25% had issues.. but most of those issues were resolved by updates to incompatible drivers/3rd party plugins and so on...
Once those kind of issues were resolved... as I said earlier, the number of my clients who still have major issues running uner Lion or ML with Logic Pro 9 has dropped to less than 5%... and to me, that respresents a minority of all users... like it or not.