Questions like phrased by you - immediate close vote. Too little information, too broad, too subjective.
"What are must-read mangas?" - are you even serious?
Possibly if the site ever gets a "community wiki" these would be allowable as the wiki entries.
Now if you narrow it down to something like
- What full-length anime movies can be considered the iconic originators of the Kemono genre?
This is an open question still open for debate, will yield a list of a at most several Tezuka's titles, and so can be answered completely and satisfactorily within one post - true the complete answer is more likely to be spread over a few posts, but still the list is completely finite. No risk into trailing off into 300 questions of personal preferences.
- *I watched Chobits and loved the idea of Persocom. Are there any other shows that exploit this idea? If they happen to be too numerous, please give the most popular/iconic ones.*
Sometimes I run into asking a question to which I expect an answer that is a fixed list of 2-5 items and only when the answers start coming in, I realize it's more of a "200-500 items" list and definitely unsuitable. And while we all have our own preferences, the answer can be limited to 3-5 examples upon which all can agree that they are iconic.
- Do you know any authoritative 'Top ten must read mangas' lists that include synopses?
As opposed to polling the community (a bunch of totally random people) here, you're asking for a resources compiled by an authoritative source. Now what comprises an authoritative source may be debatable, but you're sure to get a list much shorter and probably more reliable than polling here.