In regards to SW, I believe I have read that it is something like 50,000 lines of code, which implies it is horribly complex (I am not 100% sure on this stat, although this fact is given little weight in my opinion), and it leads to things that will change the security model of Bitcoin. As it stands today, the miners receive ~all of the transaction fees, which is what gives them incentives to keep the network secure. By removing revenue from the miners, you are lowering the EV of a $1 investment in mining equipment to use to secure the network, and increasing the EV of a $1 investment in mining equipment to be used to harm the network (currently negative).
This is completely wrong. Segwit does not have 50k lines of code. You are most likely referring to the comparison of Core and BU that was on reddit a few months back. Furthermore, Segwit removes no fees from miners. The claim that LN will steal mining fees is also a huge slippery slope.
I can check the numbers and come back here.