The ICO craze has enabled a lot of these developers to just march out on their own and start coding, make a website, answer telegram questions etc etc, all the while thinking that they are doing something truly unique. They forget that at the end it is a business and they need a product. A product needs marketing, advertisement and all that shit. Yet, the problem with most of these so-called undervalued, good devs is that they all think they are on to something unique. It is impossible for everyone to be a Satoshi or a Bill Gates and make a business from scratch simply on the basis of the novelty and brilliance of their ideas. The echo chambers of their telegram/ Reddit groups makes it all the more easier to fall for this narrative.
They all could do much better only if they used some business sense and actually invested in marketing their product, meeting potential clients and just run an actual business.
I do agree to the fact that after the quality development it is the marketing side that adds big time to the success of a new project. I have seen great quality projects that struggle in the market just because of low or no marketing, sometimes the marketing is not targetted as it should be so a marketing strategy should be deployed. As we have seen that crypto market is sensitive and volatile and it can quickly provide the much needed hype and fomo that can result in huge demand and value gain.