Plus TL tyres hold air much longer than TT tyres when a puncture occurs. So that means you can ride your bike to a puncture shop instead of having to push it. And even if the tyre is deflated, the sidewalls of TL tyres are much stronger than TT which means you can still ride your bike to a puncture shop.
If your rim is in perfect circular condition without any bends and provided you dont have spoke type wheels, TL is the best option for both you and your rims.
Some people(including me) have tried running a TT tyre in TL form(ofco with the valve changed). In my case it didnt work, but in some cases it works just fine without any leakage issues whatsoever.
If you compare the inner lips (the portion where the rubber meets the rim) of TubeLess and TubeType tyres, you will see that in case of TT tyres there are perpendicular rib like structures. I dont know what they are there for but it was around these spots that air started seeping out.
Vice versa, I dont see any point in putting a tube in a TL tyre just for the heck of it. Only if you have a bent rim or air leakage issues, you may have to put in a tube.
And it is usually better to use the tyre in the way it is meant to be used
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