Instead, as the oldest cryptocurrency Bitcoin has been developing as the most stable and secure, where even small changes, like scaling issue, is very rigorously discussed.
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Core celebrates the fact that it is the oldest coin and it respects that through not adding much change over time and instead focusing on improving and rigorously testing the already established features.
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There are many of cryptocurrencies out there now, but Bitcoin is most developed, most adopted, most secure and most stable.
Yep, money tends to inspire a conservative* instinct in all that hold it, commensurately more conservative as the value of the money increases.
That's difficult to align with something as inherently progressive as a radical and developing new tech such as cryptocurrency, and so making careful choices about how/where conservatism and progression can be applied to make a given cryptocurrency both as stable and as agile as possible is what cryptocurrency devs are tasked with. Bitcoin continues to lead on that basis.
* note that this does not mean political conservatism as a package, simply the desire to conserve the exchange value of an asset whose only inherent value is that of a medium of exchange, which is a delicate task. "Conserve" is a real word, that means something wider than its political connotations.