[Space] What is the 'Gaia' type of garden worlds like? ('Habitability 9').

[vicky_molokh]

Greetings, all!

Some of you might recognize the term from MoO2. This is a type of garden worlds that is considered to have an extremely high Habitability - in fact higher than the homeworld. Notably, it's meant to represent the kind of condition that (a) allow a higher population cap for a given TL than a homeworld of the same size provides and (b) facilitates even better agricultural yields than our world's.

So I'm curious:
What should a planet be actually like in order to provide such benefits for us Terrans? For the sake of the experiment, assume that the planet's 'wild' ecosystem is loosely derived from and/or fully compatible with ours. It doesn't matter whether such a planet has been terraformed to such a state artificially, made by sufficiently advanced aliens, or just came about through infinitesimally unlikely luckiness.

Thanks in advance!