My issue with bitcoin is the scalability. Some days it takes ages to confirm transaction on bitcoin blockchain which is not too good as at times breeds trouble between two parties who had a delayed confirmation. It is unacceptable that bitcoin blockchain confirms only 7 transactions per sec. The developers
should do something about this issues or bitcoin very soon lose relevance among crypto circle.
This has been the problem of bitcoin ever since it became famous and lot of investors specially new whales got into it. The transactions became slower with high fees. But since bitcoin is the king and founder of all crypto, all of us just got used to it.