It is not that straight forward. The starting point of regulation for fraud (unauthorised transactions) is the bank MUST refund the victim, as per Payment Services Regulations 2017, the starting point of regulation very soon will be the same for authorised push payment scams (authorised transactions).
Of course the banks need to strike the right balance between risk exposure to fraud and scams and accessibility to banking services for customers, and with this comes the risk of a rise in customer service complaints or potentially fraud and scams, if swaying too far one way.
As it stands, the banks will be bearing a huge amount of responsibility for fraud and scams, and as I noted above, the regulator is being the strictest in Europe when it comes to fraud and scams reimbursements. Also, this isn't compensation, it is actually refunding the customer in full for the scam, even if the bank is potentially not at fault. I'm not sure how I feel about the change in the upper threshold, but it would not impact the vast majority of scam claims.
As for the change of banking, this has been primarily customer behaviour driven, with the pandemic sending it into hyper-speed and challenger banks such as our very own principle sponsor, has caused traditional high street banks to switch their focus to keep with the market - remember Blockbuster? And I speak as someone who unfortunately lost their job because of the dramatic switch away from branch-based banking, as I worked in fraud for that area of the bank.