So you have a roof over your head, food in your belly, clothes on your back, ...forever.... Bless Thanos for taking the Communism approach to his newly found god-like powers.
...then what?
Be a doctor? Why, what's the point? It's all provided for you. Health care as it stands now would not exist, as the more common aliments for seeking care in the first place wouldn't happen. No job stress, no social anxiety, no traffic jams to breathe in cancerous exhaust fumes or bullet wounds due to road rage. Everyone would be chill in their homes, safe and healthy never needing a doctor to the point the entire job market for the medical fields would be too exclusive to the point of non-existence.
Be an astronaut? Why, what's the point? The only real reason to expand out into space is for humanity to grow and seek other resources to consume, but if all is provided for you then what's the point of progress?
Be a farmer? Why, what's the point? Thanos provides.
Work hard so you can buy a big house with a huge yard, white picket fences.... Not so much "why", but "how"? Most people get wealth by working their angles in a supply and demand market. Thanos will curb the market leaving no room for any entrepreneur....for example, being an inventor, an engineer? If there was a hypothetical device to improve the quality of life of other people, like the next smartphone that used holographic UI, or even the Slap-Chop 2.0......why would there even be a need for "quality of life devices" since life would be catered to anyways by Thanos? Where is the market to make easy life easier?
Be a rock-star? an artist? Why, what's the point?...considering how over-commercialized the art industries are anyways. Think of each an every one of us trying to sell their ideas to the next person trying to sell their ideas. "My ideas are better than yours". But what's going to happen is their art becomes their identity so much, they'll either kill themselves for having their voices drowned out constantly by the majority, adding to depression and other mental illness.....or they go on a killing sprees because it's the only validation they can get.
....you can call it "mechanics", I call it "purpose". And if Thanos provides what is needed for that purpose, to fulfill the requirements for those mechanics....then, again, what's the point?
Stay safe and healthy at home, do nothing but make more babies for Thanos to provide for? I mean look at the welfare state already, why are they making babies when they have no practical means to provide for the child anyways? In fact, there are welfare people who purposely continue to make babies to exploit the rules within the social service department. ....but sure, if "Thanos provides" the need to make babies for more welfare money wouldn't happen, except the human race would be so bored of itself being without purpose they would just cathartically breed itself into a worse over-populated state than before Thanos created the gauntlet.
However, .... one of the things EG failed to do is give a good anthropological glimpse of a world with half it's people gone. Cpt. America in a group comforting those who lost their loves ones...yeah, it's going to hurt of course people would need to start caring for each other more intently. Governments would collapse, but then again, why say "collapse" it would just "restructuring". There would be a "Wild West" phase in the transition, before people clamor for any resemblance to normalcy.
And when normalcy happens, they'll find an abundance of resources and no over-population to compete with. People would flourish with purpose. Thanos proved this when he spoke about Gamora's homeworld. It's brutal, but it works; as opposed to allowing everyone to go unchecked.