Too Long; Didn't Read
The issue of scalability first became apparent in 2017 or so when Bitcoin started to be very actively transacted through the blockchain as it was getting much more traction due to the sudden uptick in price. The only thing that was solved by increasing the block size was the frequency of these “traffic jams” The complexity of mining is now forcing people to pay a bit extra to have their transaction be verified first. The decentralization argument is slowly losing its grip as well, as governments start becoming more demanding on the trading information.