I have only grown without silica additives for a very long time, producing extremely healthy plants. It is possible that an additive would improve things, but I've already been producing plants that are well above average, so I'm not going to chase a chimera. Given the fore knowledge that silica is literally already everywhere (perlite is 80% silica), I'm not inclined to chase a deficiency that is unlikely to exist for two reasons: the plants don't need it, and its already everywhere. When do we see pics of a plant that is hurting that is identified as a silica deficiency?
I googled this just now, to check myself, and find that a few species of plants indicate a desire for silica. It appears that some plants do accumulate silica, and do better with an additive. Cannabis is not mentioned among those, except by Maximum Yield, which I value just slightly above toilet paper as an information source.. The 40 years of experience I have indicates that omitting silica does not hurt my yields, plant health, or bud quality.
My opinion is that it's worth running an A/B test is worth while when there is a reasonable hypothesis to be tested. The a priori information isn't indicating that here, for me. The stated benefit of silica is stem strength, and I have no problems there. In the garden, or in the bedroom, LOL. ;-)