I’m pretty sure that’s exactly the assumption here… that hollow stems are equal to plant weakness.
It actually depends on the type of plant it is. Hollow stems in some plants is a very bad thing, and a sign of much more than just plant weakness.
Hollow stems/meristems in cannabis plants are usually genetic and not necessarily the sign of weakness some may think of when they are unexpectedly encountered.
I’ve supercropped quite a few hollow stemmed cannabis plants in my day and can tell you that with a little practice you’ll be able to gauge the “crush and bend” with your fingers and never take it too far again.
It will always turn out as you intended it to. As long as at least one third of the phloem (skin) on the stem remains intact, the plant will be able to quickly heal itself without affecting its growth output. Too much damage can result in slow or stunted growth, including foliage dieback that nobody wants to experience.
Be careful when squeezing stems, gauge yourself… you are stronger than you think.
On the other hand, go ahead and abuse your plant a little… squeeze the hell out of it if you feel like it. If it’s a healthy cannabis plant, it has a natural resiliency, boosted auxin levels as well as increased vigor which creates robust, sturdy plants that can take moderate amounts of punishment, as long as you didn’t take your whole day out on it, it should be fine in a few days time… maybe give it a drink to recoup some energy after its thrashing.