My assumption was that you'd need tubes with removable cores.Not sure if you are being serious, but if you lose enough air on the road before the sealant stops the leak that you need to add air to your tube/tire, you want to use a hand pump not CO2. I know a lot of riders who do not have hand pumps and only carry CO2 inflators. It's just a consideration when using tubeless and sealant filled tubes.
Why would you go to the trouble of cutting and patching when a removable valve core solves that issue without compromising the tube in any way? If you are going to use sealant in you tubes, I guess you can do that, but it's a decent amount of extra work and time that you simply don't need to do for little or no extra cost. Cutting and patching is just more hassle to add to the negative list.
I understand for you, but for others your assumption is wrong.My assumption was that you'd need tubes with removable cores.