My wife’s Trek e-assist weighs 40 pounds PLUS a 5 pound battery. But, she greatly enjoys riding it. (It has no throttle) Prior to getting it mid-2019, most of our together riding was on tandem - lots of annual miles. Since getting it, vast majority of our together riding she’s been on the e-assist. When we do ride tandem, her power input feels just as strong, if not stronger, than before the e-assist.
When we ride our single bikes, she’s generally ahead of me on hills.