What do you want Nokia to do? They pack every feature you could ever want in a variety of combinations into a bunch of different smartphones, and you're disappointed that there's a little lag time when you try to open your contacts? It's understood that YOU'RE E50 takes considerably longer to open YOUR contacts, but this doesn't reflect the majority of s60 users, so it is still only a little lag time for the rest of us. On the N93, I wouldn't even call it lag at all. It's about as instant as something you'd find on s40.
The early firmware issues of the N73 for any of its minor early bugs can't be brought into question. None of the issues prevented any of the apps from working and were more minor annoyances than anything else. s40 isn't without bugs and firmware updates as well. Updating the firmware also isn't nearly as big of a risk as it has been hailed. Worse case scenario, should you brick your phone, your carrier should be able to fix or replace it for you. Bought it through eBay? There's no one to blame but yourself in the first place. But that's a whole different discussion about the policies of importing phones and what not. The point is that the people bricking their firmware are already using handsets that aren't under warranty in the first place, and ultimately taking a much larger risk when buying an imported phone and attempting to update its firmware. Nokia isn't guaranteeing that your N73 won't have popping noise during a call, because you didn't buy it from Nokia; you bought it from an online retailer, voiding your warranty.
Let me try to grasp this properly; you're using speed as the determining factor to decide which UI handles basic phone (specifically phone) funtions properly? What about the additional options in s60 versus s40 while you're on a phone call? Does s40 offer the conference calling options as easily as s60? Can you begin new calls while currently on one, switch, end one call, end both calls, combine both calls, drop which you'd like from the conference, or access all of your menu functions while still on that same call? What about the integration with all the other basic apps? If a friend texts you someone's number, can you call that number right from the body of the text message? Can you as easily manage and update your contacts directly from the log? All of these calling features have been standard on s60 for a long time now, with minor additions over time. If you can confirm ALL of these features on an s40 device, then you'd really spike my interest.
Please forgive me if I'm coming off harsh, because I'm really not trying to. I have no intentions to offend, whatsoever. I'm really into this argument and what to keep it as respectable as possible.