think that not having sqrt is bad, but not having integer division is awful. How much newcomers didn't find integer division and go to search other language to learn? Idk...

That's correct. Perl is not the right tool for all jobs. It excels in some things, notably processing text, and this is what I use it for. I wouldn't use Perl for some numerical work (actually, I probably would but I already know Perl; I wouldn't learn it for that).

If someone use my my my near the all variables, why shouldn't it be default? I don't know how often others use my. If >80% variables precede by "my" it could be stated as default, if not then not.

Party due to historical reasons; the early versions of Perl didn't have lexical variables, so they couldn't be the default (and a LOT of thing in Perl are the way they are due to history). Another (perhaps bigger) part is that many (most?) Perl programmers find it a genuinly useful feature.

I'm conviced that it would be very good if strictures and warnings were always enabled by default, and it's really unfortunate that that can't happen.

In book from where I started to learn Perl (it is translated to my language and shortened) there were some tables: special symbols, logical operators, other operators, precedence operators(my favourite), regex metacharacters, regex modifiers, special variables,... but there were no table where are written: function + what for it asks (scalar or list). Maybe it would be useful table for newcomers...

I don't see how perlop, perlre, or indeed, perlfunc can be reasonably shortened, compared to the originals.

Perl is a big and complex language. It perhaps would be better in some respects if it were smaller and easier to learn... It is what it is, though.