Quote - I'm going to allow that someone with the username "kawecki"  knows a great deal more than I do about Polish.   My point was, really, that  the Latin alphabet allows  Polish to create those sounds with "sz" and rz" etc. and allows Czech and Slovak to use diacritical marks to create much the same sounds in a shorthand way.   The result is that the sound "ch" (English and Spanish)  = "cz" (Polish)  = "cs" (Hungarian).  For another example, "sh" (English and Albanian) = "sch" (German) = "ch" (French) = "s" (Hungarian) = "sz" (Polish).   The Latin alphabet is the best of the European alphabets, precisely because it can accommodate all of these variations, even if they seem baffling.   Greek and Cyrillic could, if they wanted to;  presumably, Hebrew and Arabic could, too.   The fact is that that they don't.

Polish "cz" is not the same as "ch",  the equivalent to "ch" is c with '.
The same with "sz" that is not the same as "sh" or "sch", in this case the equivalent is s with '.
Latin is unable to provide all these sound, there are needed at least more 10 letters, something that Cyrilic has.
Some languages are similar to other. Portuguese is very similar to Spanish and Italian is similar. Both use the Latin alphabet that is enough for their sounds. A Spanish is able to understand a Portuguese text and with some effort Italian.
On the other side Polish and Czech are similar, both use the Latin alphabet, but as the Latin alphabet is unable to provide the needed sounds each country used a different combination of Latin letters, so each one is unable to understand what is written in the others text..
Poles and Czechs are Catholics so they adopted by religious reason he Latin alphabet, but the correct would have been the Cyrical alphabet that have the resources needed for the language.
I all of them should have used the Cyrilic alphabet, a Czech would be able to understand a Polish book and with some effort a Russian or even a Bulgarian book.
Latin is perfect for Spanish, but not for some other languages that could had a much better alternative.

Stupidity also evolves!