Here in Europe traditionally "light" deco diving is considered fully recreational and is taught since the first OW course by organizations such as CMAS, BSAC, FIPSAS, FIAS, etc.Well, then I have been a trained tech(tm) diver since forever as decompression diving was part of my CMAS*** training
The boundary between tec and rec is set just slightly above the line set by US based agencies.
Hence here it is normal for rec diving to use a compact twin set or a pony tank.
Also the depth limit for rec diving here is deeper, typically around 50m in air.
Each organization or commercial certification agency has its own rules and boundary, so there is no commonly accepted exact limit between rec and tech. Furthermore these limits changed over time, and the general tendency is to reduce rec diving to "safer" limits.
This created the space for a "grey area" between rec and tech, which is now called "light tech" or "tec lite".