:::::Oh,how poor English speaker/reader/writer search West- and East Slavic or Baltic names (which are full of additional symbols) in search engines without changing keyboard layout?And why the "reliable sources" do its best not to make names easier, but to complicate them. How can you read Encyclopaedia Britannica at all?It's full of diacritis! It is not in interest of an English speaker/reader/writer!Once again you try to oust the contradiction from your consciousness and persuade me I tell nonsense.It's just selective neglect towards ex-soviet norms of romanization. Czech diacritis are OK and cause no difficulties in reading and searching, but Belarusian, which are the same, SUDDENLY look monstrous and impossible to search.Just FACEPALM. 
 Reading WP:DIACRITIS, I see "article titles is neither encouraged nor discouraged", so my proposal mustn't be rejected.And I have no many objections to WP:WIAN. I've made my compromise proposal: to write well-known WAN names as they are in English, but use Instruction to the others (moreover,they can't cause interest of an English speaker/reader/writer)