Without wishing to be spikey I wonder why people worry when the completion date is?
I see this complaint all the time on forums.

As far as I'm concerned, its ready when its ready. In the meantime Im happy to keep my capital in the Bank and who knows the price may even rise in the meantime!

One observation Ive made is it is vital to only buy from robust developers that have a real vested interest in good customer outcomes (for exaple Proerty Logic in Saidia have announced they will absorb the recent out of the blue 6% tax hike)

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Been investing abroad a few years. Always amazed people invest in places that produce just a few months rent per year