Opera had tiling some 12-15 years ago. By default tabs were just 'maximized' to the full window, and they made it harder and harder to access with subsequent versions. I'm not even sure if it made it to the latest presto release (version 12).

Edit: the Wikipedia page shows tiling in Opera 1.0 in 1995... https://en.wikipedia.org/wiki/History_of_the_Opera_web_brows...

I'm with you though. I dumped Opera the moment they became a featureless skin around Chrome. Such a sad event

Operas best days were the early to mid 2000s