I think if there is an application then you are not prohibited from writing on the website. like Quora, it has an app and a web version. That Quora is a question and answer platform so answers can be more than 1,000 characters.
Quora, Reddit, many platforms but if it is a platform for text-based discussions, typing on mobile is painful.
In bitcointalk, we only write about 100-200 characters.
Are you sure all posters limit themselves to 100 or 200 characters for each post?
The app also makes it simple to check notifications when you're outside
Depends on each person's need but don't let notifications ruin other more important things.
Do you mean that PC/Laptops are safer than mobile devices? I think there is no guarantee for your statement about this
Safer or not, depend on how you use your laptop, PC and mobile devices but generally you are more easily to lose your mobile devices than losing your laptop.
You misunderstood my post. I mean security of your device, whatever it is laptop, pc, mobile, will be in risk if you install too many softwares, applications. The less softwares, applications on your devices, the better, in security-wise.