The complaint is that bitcoin is still on the back burner, not on the forefront and it keeps getting treated like it's just one investment avenue for the government when there's the utility and potential being presented already and has been proven already. There's also the fact that there's no care for politicians with bitcoin, any kind of protective regulation to help out hodlers didn't even pass through their heads as an idea because they think nothing more of bitcoin other than an alternative investment. That's why there are still a lot of complaints, people in power still couldn't care less about bitcoin, now imagine if they do care, the price of bitcoin right now would seem too small for many of us once a global adoption of bitcoin happens.
People always complain because there is no perfect thing to satisfy human. They want something better, they will complain, it's human instinct.
In any market, there is another thing, it's a zero-sum game and there are losers and winners in a same market. So you never have all happy people as winners in a market because the fact is there are losers who are unhappy and have many things to complain. Their complains come from their losses that are not because of Bitcoin technology and design.
People can change themselves and turn from losers to winners and stop their complain. Otherwise they will complain about Bitcoin forever until they exit this market.
Yes you are correct that there are losers and winners in the market but from what I can understand from what OP meant is that the complaints from the fact that bitcoin is still not that widely recognized which I can support because I think that bitcoin needs the recognition that it deserves, the price will just follow as soon as bitcoin becomes even more popular. In regards to people complaining about the market, my guess is that some of them has their brain wired that way because it eases the loss when you can complain and blame other stuff, at least that's what I believe is the reason why they complain because I'm like that sometimes.