There is a cure if you really want one. I found it after a lot of studying lenses, and I continue to heavily study the equipment that is available.
I decided to build a minimal kit, that has as little as possible and some variations inherent. So when I leave the house I can pick 1 body and 1 lens out of a pool of 2 or 3. Go out with 2 bodies and 2 lenses, or go out with 2 bodies, 3 lenses with the third in a minimal bag. It becomes an even neater way of doing things if the one body is a crop, and the other is a FF and you can switch which lens goes on which body for a slightly different effect.
Now, while you build your 2 body and 2 or 3 lens kit, you thinking what/how you want to be shooting. You cannot cover every possible situation without owning a ton more stuff, but you can figure out what you do most, and what is meant for a special occasion. Now you can either supplement some extra stuff for those occasions where it would make sense, or just rent for those days which is altogether more affordable. This means, you always own a very good base, that suits your style and you are never limiting yourself because you have full access to everything else that could be useful on a rental basis. If your style/needs change, then switch around your base kit.
You might choose to only have 1 body, I'm just eluding to the kit I'm working on. You could do a 1 body with 3 or 4 lens kit and save days you might want to go out with 2 bodies, to rent the 2nd body. This is all personal decisions that you have to make to suit you. I really would spend your time figuring what you want to shoot most, and what setup would work for those scenarios, paying careful attention to what you are going to bring with you in the situation and how you plan to carry it all and effectively use it. It's important to be realistic and come up with a plan that doesn't have you switching lenses in the field all day and lugging around a massive backpack. So look into carrying/harness gear as well and figure out what you think will work best for you.
Now this will not stop you from studying equipment, I love that, it's a fun distraction. But knowing that you have a full permanent base kit that covers you're main uses in photography, and can easily be supplement by a 3-day or longer rental at affordable prices, and all of a sudden you no longer feel the need to buy it all, you just want to know it all and have access to it.
Remember, at the end of the day, even if you have 1 of everything Canon makes, that you can't just bring it all with you and use it effectively in any given situation. Making important decisions before you leave the house preparing in advance to be versatile, mobile/nimble and well prepared for the situation you are going into.