My bike (Cannondale Synapse Neo) is only 36lbs. But I often forget to turn on the assist until I get into a hill.The other thing about an eBike is you do not have to turn on the assist to ride if you want a real workout. I'd argue that climbing hills or even the flats pedaling a 55 lbs bike without or even in Eco mode does plenty for muscle workout and heart rate.
Plus speed is your friend and way more fun. You can go twice as far and see more in the same time with less impact, decent workout & shuttle to the trail head vs riding the bike. Afterwards you are not as trashed if you chose. Or you might ride on days you aren't feeling it and just get out with more assist for a casual leg stretch.
An avid gravel biking couple used to give me grieve, but went out and got two Pivot eShuttles which are in fairly light by comparison. They are much easier to schlep around than my Rail 5 beast, have programmable power settings & they love the full suspension for gravel riding, rough roads & single track. No more wrists, butt and lower back soreness.
They say in the first minute you ride an eBike, you'll want one. Be sure to look past the ones you test drive and check your priority boxes. If I was looking to trade mine, I'd take a hard look at the Trek Fuel EXe for it's versatility.
Something like the Trek Powerfly FS might be worth a look for more of a crosscountry/gravel option.
For me the best thing about e-assist is bonk insurance. Hitting the limits of your endurance isn't just a miserable experience, it is bad for you. "No Pain, No Gain" is the dumbest thing ever.