Performance mostly matters depends on the target audience. For example, if you have a React-based wrapper around some SAP Gateway calls to replace the standard

Performance mostly matters depends on the target audience. For example, if you have a React-based wrapper around some SAP Gateway calls to replace the standard SAP UI then the user doesn't have much say. Because of the perceived better UX. The users of the solution inside companies (think multinationals, larger government etc) your call agent that use the React-based SAP portal can't really say I am not going to use it. Hands are tight. The only time performance really matters when you have paying customers