In fact this is true, Bitcoin needs a long time to confirm the transaction as it requires large fees and these are things that make a lot of people prefer to use altcoins like XRP, TRX, LTC, Dash because it is much faster and its fees are low compared to Bitcoin.
But I think this problem has been solved with the Bitcoin lighting network where fees have been reduced very significantly and the speed has become superior to altcoins as well but the Bitcoin lighting network has not been widely popularized yet.
l do agree with your words on that, BTC needs really long time to be confirmed by the whole world as a payment system. People are interested in using other altcoins for the payment system. The first reason is the fees of BTC, if we compare the fees altcoins to BTC, as you said fees are low and very useful than BTC. l think people will still prefer altcoins in the future for these reasons.