Plants are adaptable, and lack of a taproot doesn’t seem to be any kind of liability. Most trees don’t even maintain their taproots, at least according to the Morton Arboretum:
“10. Myth: All trees have a taproot.
Fact: Trees that germinate with a taproot eventually lose the taproot as the secondary roots grow and become more dominant. For most trees, the taproots that had initially established themselves are nonexistent when the tree reaches maturity.”
Here in the interior of Alaska, no trees have deep taproots–the ground is too cold. I’ve dug out stumps from sixty foot trees, and never observed roots penetrating much more than two feet. Elsewhere, trees send down “sinker roots” from laterals, which are able to replace any of the defunct taproot’s functions.
If you’re interested in roots, Robert Kourik has a couple of excellent books on the subject:
https://robertkourik.com/books/roots.html
https://robertkourik.com/books/understanding-roots.html