Correction to all the altcoin maximalists that are saying, "BiTcOiN iS oLd TeChNoLoGy." - Your altcoins have serious security risks and you are endangering people by telling them to buy your altcoins.

TL;DR - If you tell people to buy altcoins designed for payments, you are telling them to shoot themselves in the foot, figuratively speaking. Don't do it.

I can think of three BTC hardforks that have been successfully 51% attacked, and one altcoin that is "superior technology" falling victim to a month-long spam attack. When has this ever happened to BTC?

The energy costs associated with bitcoin mining are the same costs that keep the network secure. And to the "big blocker" crowd, running a full bitcoin node with big blocks is prohibitively expensive in developing countries. On bitcoin you can run a full node on a raspberry pi and external HDD for 40 USD.

How are you endangering other people by telling them to buy your altcoins? Simply put, if your altcoin was made to do payments, nothing has outperformed bitcoin in the way of store of value or savings vehicle. So while saying, "Buy my coin, it's better than bitcoin." to newbies, you are telling them to literally lose money over the long run. Even more so because there are no financial institutions besides centralized exchanges that would be interested in buying or selling your altcoins. Not a single altcoin that was created for payments has out-done bitcoin to this point in time, or managed to stay above its own price peak in terms of since 2017.