When I had a Pixel 6, there was a bug that caused awful battery drain when on 5G, so I changed the preferred network setting to LTE for like a month while waiting for them to fix the issue.

It had NO effect on my regular use at all. Running speed tests showed that my max download speed was significantly slower while using LTE, but that’s obviously not indicative of real world usage. If there was any difference between LTE and 5G in terms of page loading, media streaming, etc during regular daily activities, it wasn’t perceptible.