Not 25+ percent THC potent.
Herbal cannabis potency increased from 5.00% THC (3.91, 6.23) to 10.22 (9.01, 11.47).
To quantify changes in (i) potency (concentration of Δ9‐tetrahydrocannabinol; %THC), (ii) price (euros/g of cannabis) and (iii) value (mg THC/euro) of cannabis resin and herbal cannabis in Europe. Repeated cross‐sectional study. Data collected from ...
www.ncbi.nlm.nih.gov
Between 2006 and 2016, the average potency of herbal marijuana in European countries rose from 5% THC to 10.22% THC, nowhere near the potency of today's weed.
Regardless of what you may think, Holland weed isn't that much different than weed sourced in other parts of the EU.