If you fast-forward the podcast to 1:38:50 Charles begins to discuss his issues with Bitcoin and what he finds to be the "problems" with Bitcoin. Initially, this really excited me because I love a good argument against Bitcoin from one of the cryptospace's most popular. While I was hoping for a unique, fresh take on Bitcoin's issues, I ended up getting the same progressive response aimed at Bitcoin's lack of "improvement". This turned out to be the same regurgitation of words mixed with some clever verbiage, which I found boring put quite frankly.
Charles can talk about his opinion, everyone else can too.
Everyone can see and say Bitcoin is not perfect and need to be improved more and faster. Everyone can say they find better cryptocurrency than Bitcoin and choose it for their digital transactions or investment.
The matter is, their thought does not mean it is right and Bitcoin is bad or worse than others. Bitcoin has biggest network (see its hashrate) and if anyone says Bitcoin has low block (10 minutes), I agree. It does not mean Bitcoin is worse than other cryptocurrency as a transaction method.
If you want safety, safety first, Bitcoin is the best.
Else if you want only speed, faster than 10 minutes or you need your transactions get confirmed in a few seconds, choose altcoins but they are not safe.
It is not correct to say Bitcoin is lack of improvement. I disagree.