PIE reconstructions are very interesting peaces of linguistic, but they seems often mistaken. One great analogy, I first saw presented in some Linguisticae[1] video I think, is "what if we had no direct trace of Latin and we were looking to recreate proto-Romance roots." Of course Latin itself refers to very wide set of linguistic practices, with all the diversity we can imagine through time, space, individuals and even for a given individual there are difference as they age and depending of context they will use different sociolects and language register, plus of course not everyone is mono-linguistic.
[1] https://www.youtube.com/@Linguisticae