Windows Remote Assistance lets someone you trust access to your computer from any location in order to assist with resolving problems. You should only allow a helper to connect to your device if you initiated the interaction by contacting a reputable Tech Repair Service or Microsoft Support directly. In some cases the need for assistance may be needed immediately so this is why Microsoft allowed this capability
However, scammers and criminals are known to use (misuse) legitimate programs like Remote Desktop and TeamViewer to help facilitate nefarious actives such as hacking a computer in order to steal data, commit identity theft and spread malware.
Microsoft can only warn users about scammers which they have been doing for years as I explain in detail in this topic.
Security ultimately is the responsibility of each individual user which is the reason Microsoft provides numerous Support articles to help folks ensure they are safe. If they choose to ignore those warnings, neither Microsoft or anyone else cannot protect them.
Security is all about layers and not depending on any one solution, technology or approach to protect yourself from cyber-criminals. The most important layer is you...the first and last line of defense.