Whilst I see your point, and many will argue that Bitcoins slow pace of development is hindering it, you have to ask what these existing projects are actually achieving right now. They are building for the future and by that point, I think Bitcoin will be the platform of choice, providing of course Bitcoin make a complimentary decision on their future direction. We are looking at advance / future technology here and existing projects may just be trying to run before they can walk; everything has to come together which will take time. I'm not a fan of Ethereum, their gas fees are hindering their project more than Bitcoins limited throughput. Matic will die by the sword based on what Ethereum does. Only time will tell.