If you have other gear, receiver or whatnot, just sell it, use the cash for more treatment or the next step up HSU (or dual).
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But yes, for your setup, I’d much have a 2.2 bookshelf setup over a 2.0 tower setup, as hardly any are full range and can reach >100dB in the bass at the listening position with ease .
If you had towers that got loud enough and were true full range, than there is really no downsides, unless you have some bad room modes.
Bookshelves don’t inherently have better imaging than towers, it’s just a lot of tower designs are not optimal (like using 7” woofers as a midrange).