In my opinion Fresco should support switching between the last used brush, item, etc. if desired using the the "button" on the pencil like other apps. This has become the "expected behavior". This is a behavior that I feel should be "selectable'.
I understand the request here but I'd suggest you post about the same in our UserVoice here: https://adobefresco.uservoice.com/ as our engineers and product team keep a close watch on the features and suggestions posted here.