Lack of validator distribution throughout the public can certainly pose a threat to decentralization, but so can powerful, near celebrity-like leaders. The creators of Cardano and Polkadot, Charles Hoskinson and Gavin Wood, were both co-founders of Ethereum along with Vitalik Buterin.
Within crypto communities, they are extremely well-known figures who carry a high degree of authority in the space. Part of the issue with cryptocurrency is that it is still a highly confusing and complicated subject for many. For that reason, many investors take the word of some of these more well-known figures.
In these cases, projects can take the direction of whatever the figurehead deems best, rather than what may actually be in the best interest of the broader community. While the best interest of the community has rarely if ever deviated from what the figurehead pushes for it still puts a whole cryptocurrency ecosystem at the whim of an individual.
For this reason, Bitcoin benefits greatly from the absence of Satoshi Nakamoto. So many people have yet to fully grasp the concept of decentralization and the purpose of Bitcoin that if Satoshi were to appear today and say that KYC (know your customer) should be integrated into Bitcoin many would likely all agree.
Other Aspects To Consider
The above aspects of a blockchain are arguably the most important when considering where to invest and what to use for transactions or decentralized finance products, but other things, like the Dapps that exist in its ecosystem and a chain’s cost and speed, are definitely worth considering.
Dapp Decentralization
Understanding how a decentralized application is developed and how decentralized it actually is is something that may be worth the research prior to its use. Many currently popular Dapps were created by small teams. While the smart contract for the Dapp may run on a blockchain like Ethereum’s, the front end, or user interface, is controlled in-house and sometimes is not open-source code.
There are some coming out that are more decentralized where its development was done by a decentralized autonomous organization (DAO) and where the front end is stored on the InterPlanetary File System (IPFS), a decentralized file storage system.
In the event of a total regulatory ban on DeFi, Dapps that have central control where its front end is run on an in-house server may be shut down, whereas one created by a DAO with a front end stored in a decentralized way would likely be fine.
Cost
Speed
Choosing an Ecosystem
Everyone has different priorities when entering the cryptocurrency space. Some are more focused on technology and what it could theoretically do to the way society functions. Others have entered with more of an economic incentive.
The former would likely be more concerned with decentralization and that all demographics have the ability to participate. The latter may be more concerned with transaction speed and cost.
If you are someone more interested in speed, transactions costs and trading, it may be wise to first understand the purpose of decentralization and the problems it aims to solve. It also may be beneficial to question the legitimacy of projects that are more centralized and what their motives are. Taking all these factors into account before placing making an investment may help you to avoid scam, hacks or other issues.