why are people weary of it?
Because most people don't like change.
Ans also because some people fail to see the bigger picture, they think every transactions in the world should be stored in the blockchain. How silly? You must seriously lack some vision to think something that stupid.
Offchain transactions are a requirement to scale, using different companies Gift Card systems or internal payment networks would work ,
but would not give them the ability to create a fractional reserve, as all external transactions between companies will require the blockchain.
LN will add direct fractional reserve ability to its network, which puts the people right back in the same situation as they are now with the banking system,
only the stupid or corrupt behind this endeavor will deny this fact.
FYI:
Now we all know why they don't want the simple route of just increasing block size or lowering block speed, neither of those options would let them get away with creating a fractional reserve system like LN will.