I believe developers saw the the vision of Bitcoin and try to explore from the vision by introducing and making their own coin but they lost focus because they only have one goal in mind which is making money, forgetting the most vital ingredients in developing an asset. They forget that they are certain steps and strategies to undergo before accomplishing a good assets or goal.
Some of the reasons why I think some developers fail is because:
1. Lack of funding both the starting aspect and the launching aspect (lack of money to continue)
2. Failure in out righting frauds
3. Failure to evolve especially when the coin initially start bomming
Most developers have only one vision which is making money that is why many coins doesn't grow and they failed because they didn't see the vision ahead.
I can agree with you, and what is also essential for me is that community of project must be always alive and should stikc togheter as one, cause we as a people making some platform exist. That is why i always watch out for how community also looks and interigate with their customers. There are plenty more to come and some will succed some will failed, i want to help as ell them which i did with illuvium and lunafi when they launched platforms, cause i'm sticked around community and everything looks good for now.