This looks very good.
A lifehack is a technique that can be implemented quickly and is used to make one's physical life more efficient when a more standard approach (as defined by that area's experts) or a product is either unavailable or undesirable. Lifehacks are creative, meaning they use materials that are on hand for uses besides their intended use.
That's good. However, people will not list everything they have to hand to make this. The solutions need to use products most people in the developed world have - so a solution involving a magnifying glass is good, but one involving a 25 litre bucket probably isn't.
Product recommendations are still off-topic, and all questions are required to be about physical problems. This means that psychological questions will still be off-topic, but also includes questions in other areas such as mathematics and programming as being off-topic.
That's interesting. I think a lot of efficiency is psychological, however, I can see your reasoning from reading the chat (anything can be linked back to psychological problems). Possibly editing that into your "question" would be good - explain why.
One thing that is needed for this scope to work that hadn't been discussed on Meta before is the necessity of the "what have you tried" section. Because a lifehack is an alternative solution to a problem, it is necessary for us to know exactly what solution the person asking the question has tried and/or the reason(s) why they aren't satisfied with the use of that method, in order to solve the problem.
This is a very sensible requirement - just like on SO, you need to have "a basic understanding of the problem in case".
Because a lifehack is an alternative to a solution or product that is unavailable or undesirable, we need to know what product or solution they are trying to work around. Unfortunately, this will probably leave some questions without a site to be asked on, but we simply can not take every question if we expect to have any sort of quality control.
That's not unfortunate. SE is a Q&A, not a wiki answers / yahoo answers. When I first saw the way this website was going, I was worried it was turning into a "any question" site. This should fix that.
Following the standards of Stack Exchange, questions that prompt for simple answers of yes or no are off-topic. See this discussion on Meta for more reasoning.
The meta post should be summarized into your "question". It needs to be clear how it applies to us - essentially just write that "You must have tried out your lifehack. Included with this are questions asking for verification about whether lifehacks will work or not. This is because whether or not a hack is successful is subjective, and it is up to you to decide if a lifehack is applicable to your situation."
Finally, medical questions are off-topic.
Now that one is interesting. Does this count as a medical question? I think that it is a medical question, but I am not convinced that it should be off topic here. It's just my opinion, and I know that there are good reasons for them being off topic (you said them yourself). However, I am worried that this is going to cut out a lot of good advice and information that you are unlikely to find elsewhere on the internet.
Remember it is up to everyone to work together to make this site work. If we're going to pull this site back together we need to work as a team and not individuals. If we apply these rules consistently to each question, we should be able to create a site where it's clear to new users what this site is truly about.
These rules are a very good start to this. However, I am not convinced that it is 100% clear exactly what is on topic / off topic - especially to a new user, and even to those who haven't read the chat stream. I am not sure how to get across exactly what is on topic, and we can't list everything that is off topic - that list would go on forever.
