No Cyrillic support for Google fonts by default in Enfold theme. Why?

For all computer-coding-programming related people for some unknown reason is absolutely clear that everyone on the whole Earth just dreams about adding pieces of code to customer ready products.

You know, guys, you are totally wrong! :)

Is it correct method to add Cyrillic support to the newly added font?

add_filter( 'avf_google_heading_font', 'avia_add_heading_font');
function avia_add_heading_font($fonts)
{
$fonts['Roboto Condensed'] = 'Roboto Condensed&subset=cyrillic,cyrillic-ext,latin,latin-ext';
$fonts['Roboto Condensed'] = 'Roboto Condensed&subset=cyrillic,cyrillic-ext,latin,latin-ext';
return $fonts;
}

add_filter( 'avf_google_content_font', 'avia_add_content_font');
function avia_add_content_font($fonts)
{
$fonts['Roboto Condensed'] = 'Roboto Condensed&subset=cyrillic,cyrillic-ext,latin,latin-ext';
$fonts['Roboto Condensed'] = 'Roboto Condensed&subset=cyrillic,cyrillic-ext,latin,latin-ext';
return $fonts;
}

Doesn’t work. (

The following string now appears in all my pages:
<link rel='stylesheet' id='avia-google-webfont' href='//fonts.googleapis.com/css?family=Roboto+Condensed&subset=cyrillic,cyrillic-ext,latin,latin-ext' type='text/css' media='all'/>
while Google offers this css link for Roboto Condensed font according to my charsets selected:
<link href='https://fonts.googleapis.com/css?family=Roboto+Condensed&subset=latin,cyrillic-ext,latin-ext,cyrillic' rel='stylesheet' type='text/css'>
Basically both strings are the same, I can select Roboto Condensed from both dropdowns in General Styling > Fonts, but the site still appears typed with standard sans seriff font. What is wrong?

I understand the reason, but no, I don’t mind and will never do.
Lets find another method of making things working.

No change. Still doesn’t work.
There is reference to Google’s css for Roboto Condensed in the pages code at line #20, but Sans Seriff still used for both headers and body.

Same result.
Actually it is clear that I can attach the font to the Enfold theme with all methods offered.
The problem is it can not be used by css for some reason.

Hm… Everything is OK if

function add_subset_func($fontlist) {
	$fontlist .= "&subset=latin,latin-ext,cyrillic,cyrillic-ext";
	return $fontlist;
}
add_filter('avf_google_fontlist', 'add_subset_func');

add_filter( 'avf_google_heading_font', 'avia_add_heading_font');
function avia_add_heading_font($fonts)
{
$fonts['Roboto Condensed'] = 'Roboto Condensed';
return $fonts;
}

add_filter( 'avf_google_content_font', 'avia_add_content_font');
function avia_add_content_font($fonts)
{
$fonts['Roboto Condensed'] = 'Roboto Condensed';
return $fonts;
}

is added to the child theme. But no result when applying changes to the main functions.php.