Ah the Ekranoplan. Promised to be the next big revolution yet so far has been a complete evolutionary dead end in terms of high-speed ships. Even the hydrofoil has died and to some extent the SES too. The 60s-late 80s were heady days when surface-effect high speed vessels seemed to be the future.
I view the Ekranoplan as another product of the technologist USSR - in that a bunch of skilled engineers and academics refined the concept towards the nth degree without really asking "why is this needed" without the need to worry about costs. Of course it wasn't just design bureaus, many technical colleges and DOSAAF clubs tinkered with them too. In the West, beyond Lippisch, nobody really invested into the concept. Probably having a lot of flat land and snow contributed to the Soviet preoccupation with WIG. But certainly you can't divorce Ekranoplans from the hydrofoil, air cushion and (to a lesser extent) SES efforts they were making - all paths to high-speed marine travel were being followed.
'Loon' and 'Bora' to me are two sides of the same coin. Both were probably flawed solutions, especially when the Soviet's weren't short of large FACs with SSMs.