Everyone should do what works for them. That said I don't worry about using a big gear some of the time. Way back when I was still young some of my buds marveled at the fact that I was often on the big ring on some fairly hard climbs. I semi jokingly said I was saving my thumbs because I was sure they would fail before my knees would. Well here I am at almost 73 with healthy knees and nearly constant pain in my thumbs and wrists for the past few decades.

Even as an old codger I still use a wide range of cadences. I spend a lot of time at 90 rpm and even some at 100, but I also climb at 60 a lot and sometimes less maybe at times a good bit less. I am pretty sure if I ever do blow out my knees it won't be because I don't spin like mad all the time. I suspect that in general pedaling at a variety of cadences is probably best for joint health.

Just my opinion though.