از دیدگاه من

Yes, it can be. Use 'be nazar-e man' or 'be nazaram' with close friends unless you are discussing a serious topic.

Absolutely! It means 'from your perspective' and is a great way to ask for someone's opinion politely.

'Didgāh' is a 'perspective' or 'viewpoint' (more formal/analytical), while 'nazar' is a general 'opinion'.

It's a short 'e' sound, like the 'e' in 'bed'. It connects the two words without a pause.

Only if the text is professional or about a serious debate. For 'Where should we meet?', it's too formal.

Yes, 'didgāh-hā', but it's rarely used with 'man'. You might say 'didgāh-hā-ye mokhtalef' (different viewpoints).

Mostly, but it's more like 'From where I stand'. It implies a more considered opinion.

Modern poetry, yes. Classical poetry uses 'nazar' or 'chashm' more often.

No, it almost always comes at the beginning of the clause it introduces.

Saying 'be didgāh-e man' instead of 'az didgāh-e man'.

Yes, it is the standard phrase used by experts and commentators on BBC Persian or Iran International.

Yes, 'az didgāh-e ma' (from our perspective) is common in corporate or group statements.