I think this is where I do miss something here. Isn't the principle of Bitcoin (and most Cryptos) to never change the technology they start with ?
-snip-
BTC has very active development from the Core team and a lot of other independent developers, so I don't see what makes a new coin which everyone actually has to actively sell their BTC for so important.
- When you speak about the BTC Active Development team, we are speaking about
https://bitcoinfoundation.org right ? Who is behind the Core Team?
The people who are behind the Bitcoin Core team are listed
here. Bitcoin Core is the reference client for BTC and is currently used by
about 75% of listening nodes. Note that listening nodes do not make up 100% of nodes.
Anyone can contribute to Bitcoin Core, but of course the contributions that they accept are typically going to be the ones which align with the main developers' viewpoints, which is why it's important to note that anyone can develop their own client and get people to run it, hence why there are many active developers other than Bitcoin Core.
And basically, the forks are happening when a big part of the community is not agreeing with part one or another development made by them ?
Yes. Usually the forks we are talking about are forks of the Bitcoin Core software in which people are taking the Bitcoin Core software and altering it to suit their preferences. Of course they have to garner a lot of support for their alteration, otherwise the fork does not become relevant. There are other forks including unintentional ones, but the ones we are talking about are intentional.
And thus, my assumption that Bitcoin technology is not evolving is completely wrong?
Yes, IMO.
And, for example, I guess that the energy-consumption problem is something that they actively always try to find solutions about / make evolve in the good direction.
Yes, and altcoins are certainly providing interesting solutions as well, such as Proof of Stake and NEM's Proof of Importance system. As of yet, it seems that the BTC community and developers do not yet think they're secure enough or good enough to replace the current Proof of Work system, and the Proof of Work system may be hard to remove because it would render billions of dollars worth of mining equipment obsolete.