Symmetric/asymmetric comparison and synergies

We have seen that symmetric and asymmetric encryption feature multiple differences. Let's recap these differences as follows:

Domain	Symmetric	Asymmetric
Able to grant	Confidential	Confidential, offering integrity, authentication, and non-repudiation
Needed key(s)	A single shared key	A public key and a private key
Key exchange	Complex and offline	Simple and online
Scalability	Not scalable, keys increase exponentially	Scalable
Key size	Small	Big
Implementation speed	Fast	Slow
Best for	Bulk data	Small amount of data, key exchange, digital envelopes, digital signatures, and digital certificate

As you can see, in multiple domains, symmetric and asymmetric keys are exact opposites. This means that they can be used together to fill each other's weaknesses. A way to do so is to create a hybrid encryption to initialize the communication using asymmetric encryption, and in this communication, exchange securely a key that...