So much bitcoin hate the past few pages.
I am farrrr from an expert but will try to clarify a couple things for those of you who like yelling at clouds.
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bitcoin transactions are slow/expensive
Currently, yes. Because transaction costs are measured in btc and not usd, the recent massive price run-up has made the transactions quite expensive in usd and all the increased activity due to the price run-up has also filled up the blocks and made transactions slower. Bitcoin is built to be able to be modified/improved, and solutions to these problems are being worked on. Bcash was one attempt at solving some of these problems but for the most part the bitcoin community has agreed that it was not the correct solution at this time hence btc still being ~5x the price of bcash.
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I understand that blockchain tech in general has value, but how does that translate to bitcoin value.
Bitcoin is the oldest, most widely adopted, most secure implementation of blockchain technology. This makes it a very good bet to be at minimum one of the best candidates for "cryptocurrency most widely considered to be a good store of value" in the future. If the scaling issues are fixed, it could also get back to being a strong transactional currency like it was in it's earlier days when it had nearly instant transactions and nearly 0usd in fees. In it's current form it is clearly not the "best" available cryptocurrency in terms of features offered, but like i said above, it can and will be improved and many features proven useful (and secure) by other cryptos will get implemented into bitcoin.
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even if blockchain is a big part of the future how can you be so sure bitcoin will "win"
The network affect is strong, if all cryptos were starting over from 0 market cap right now then bitcoin would probably get left in the dust but the huge head-start matters quite a bit. So in spite of it's current problems, it's pretty clearly the favorite to be the dominant crypto of the future. Whether being the favorite in a field of thousands means it has a 10% chance or a 90% chance is anyone's guess, but just because it's not a guarantee or prohibitive favorite doesn't mean it's automatically a bad bet. And in my opinion chances are if you already own some bitcoin you will be far better positioned to be a relatively early adopter of whatever other crypto overtakes it down the road.