Let's say someone is interested in a fairly simple will (simple financial picture with a house, mortgage, 2 bank accounts, 2 retirement accounts; no prior wills; simple family structure, nearly-bog-standard inheritance wishes); and a reasonably normal living will (largely based on standard one that can be found online in a state I live in).
There seems to be a rather large cost difference between doing them with a regular lawyer (I saw quotes of $500 for 2 documents); vs. an online service like LegalZoom.
Usually, it's prudent to assume that you get what you pay for, so it seems reasonable to worry that LegalZoom documents come with meaningful possible downsides.
Is that the case, and if so, what are the downsides to worry about?
Updates to clarify:
An answer was posted that seemed to answer a slightly different situation than what was asked, so I'd like to clarify:
The financial picture truly isn't complicated (no debts outside mortgage, no complicated assets outside house/checking/savings/401k accounts, all assets and family are in same state, assets are less than state/federal estate tax limit; no prior marriages or prior children or other potential liabilities, etc...).
People doing the will are reasonably intelligent, e.g. they are smart enough to realise specific people named in the will may already be not alive during probate and designate reasonable backups for both will executor and child guardianship etc...
The person getting the will is intelligent enough to know that if said picture changes in any way, the will DOES need to be updated, and can be relied on to do so (e.g. in case of a divorce, or if financial picture becomes less simple etc....). So "your internet made will is fine now but won't be in 40 years" is not really an applicable downside, assuming "fine now" is true of course.