How badly would it break things is I brought back PF1-style wands?

[glass]

As in X charges, use them until they are used up, then buy another one (X was 50 in PF1, but need not be). Obviously, nobody would want to buy PF2-style wands, but that is hardly different from now. Aside from that, what would happen?

[Perpdepog]

There are some spells I'd still rather buy as PF2E-style wands, specifically those at lower level that I'll be casting every day. You'd save money in the long term.

Aside from that, IMO the only real thing you need to consider is price, because you are effectively bulk-purchasing scrolls as a single item. The price of the wand, and how many charges it's got, will determine it's desirability.
(I guess you also technically have to calculate the bulk difference too, but that's much less of a concern unless you and your group really like tracking bulk.)

[Wendy_Go]

Another difference is hand & action economy. A wand that can cast (for example) Fireball X times can be held in doesn't need you to manipulate to ready a new scroll each casting if you want to cast multiple times in a row, and only occupies one hand (vs maybe 2+ if you hold multiple scrolls).