Personally I don't think the Xiaomis are better Nokias - better performance specs maybe, but not better phones overall. Anyway, many people will probably disagreed with me! I'm sure that HMD are looking at this new phone and working on a new model which will be much better.
For info, here's a comparison of the 7 plus and the Poco:
The specs are very similar, and I don't believe the claim about battery life being 30 hours for the Poco, not with that big a screen and powerful processor.