They’re just really poor value for money, for any gaming but especially Zwift. Virtually everyone is better off building a cheap Zwift desktop system (doesn’t have to be from scratch) and then buying a normal laptop if they also need one. Zwift is a 3D game, you’d need a gaming laptop with dedicated graphics card:
Pros
Self-contained
Portable
No building required
Theoretically convenient
Cons*
Very expensive for what you’re getting
Not upgradable in any meaningful way
Compromised performance (thermal/power limits)
Waste of a screen (assuming you plug it into a bigger one)
Pointless battery [which is dying]
Proprietary parts throughout
Difficult/impossible to repair
Confusing model variants
Constantly setting it up isn’t actually convenient at all
*Some exceptions do exist