Soldered RAM is not necessarily bad, because it is usually more reliable than SODIMMs, so it is less likely to require replacements before other parts fail and it is less likely to suffer from transient hardware errors that are not caught due to the lack of ECC memory in most laptops and mini-PCs.

However I consider soldered SSDs and/or soldered batteries as completely unacceptable, as they limit the lifetime of a computer to low values.

At least you have the choice to pick one that does not.