I saw this Trace Velo short about tubeless Schwalbe tyres for his gravel bike build and they were leaking badly from the sidewalls despite being sold as tubeless compatible. Comments to the video shows some people have the same tyres without issues and some just allow the sealant to bed in the gaps over time to sort the problem. Some never sort the problem and have to change brands. Seems very inconsistent quality to me. Difficult to judge fairly without comparing to similar products from other brands I suppose. I'm sort of feeling at best Schwalbe are mid-level quality typically. The only tyres I remember having really poor life from were some Schwalbe Marathon City Jets which I think from memory were 26"x1.5" and the sidewalls on both tyres perished quickly. I am a heavy rider but the sidewalls were particularly thin and had little strength to them and cracked fairly quickly I ran them until they looked really dodgy but had to replace them despite having loads of tread left purely because the sidewalls were so perished. I replaced them with some Kenda's which admittedly were twice as heavy and half the price and had no issues. The Kenda's I think were 26"x1.95 so a larger volume tyre and definitely a lot more comfortable too and with surprisingly faster braking times that were a night and day difference which I guess was the larger contact area. The city jets were more likely to skid on loose surfaces if I braked aggressively so I was always feathering the brake lever so not to brake too hard which meant longer stopping distances I stopped doing that with the Kenda's.
how well it seals the tyre on the rim depends on the sealant used but some tyres and rims can be a pita to seal up and takes more sealant.
the sg tyres are so tight and seal straight up as so tight on the rim but a standard tyre is so loose i need 250 psi to blow it on to the rim and then add a bit more sealant and it seals up and stops leaking.
i have never had a tyre not seal up to the point i could not use it and where a air blast pump comes in handy.
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E-25 (26x2.35", 26x2.6" and 27.5x2.6" size options): Tyres with the recommendation "E-25" are the perfect choice for all pedelecs with pedal assistance up to 25 kph. The most important criterion for this recommendation: security
E-50 (27.5x2.4" and 29x2.4" size options): E-Bike tyres with European ECE-R75 approval. Schwalbe's recommendation for fast E-Bikes - S-Pedelecs with type approval, insurance and motor assist over 25 kph – for which a special tyre approval is necessary
Im not sure i agree with that Crackings usually down direct sunlight. Breaks down the rubber. A new tyre is flexible and supple. I wouldn't have thought its ability to move more would lead to it cracking.