I've been using blockchain monthly for a couple of years with no issues until recently. Last month confirmation took overnight. This month, it took almost a couple of weeks. I never considered fees before now. Maybe there are other issues with blockchain, but there is no doubt if you look at https://bitcoinfees.21.co/, the problem is that blockchain is not just recommending insufficient fees, they are warning users against them. This tells me that blockchain has been sitting on their market share without bothering to look at what has been happening in the market. If they were being proactive, they would have had a working dynamic fee calculator. What they are calling a dynamic fee calculator is a complete joke. I have no way to prove it, but I suspect the massive backlog of unconfirmed transactions that has been present in the 91-120 sat/B category of the above link for the past couple of weeks has been caused largely by blockchain.