Short answer: probably, but not for the reason you are expecting, and not the kind of website you are picturing.
The long answer is that the question changed. Ten years ago a website was where people found you. Now people find you on a map, or from somebody’s recommendation in a Facebook group, or because they drove past. The website is where they go afterwards, to check whether you are real and whether you are open.
That is a much smaller job. It is also the job most small business websites still fail at.
What people actually do on your site
I have watched the analytics on about sixty of these now, and the pattern barely varies. Someone arrives on a phone. They spend between eight and forty seconds. They look for hours, a phone number, an address, and some sense of what things cost.
Then they either call, tap directions, or leave.
Nobody reads your mission statement. I say this gently, because a lot of people have paid for one.
When you genuinely do not need one
You are fully booked from referrals and turning work away. A website will bring you more enquiries you have to decline, which is a slightly annoying way to spend money.
You sell entirely through a marketplace and your customers never search for your name. Some resellers and craft sellers are in this position. A Google Business Profile is enough.
You are retiring in eighteen months. Genuinely. Do not.
When you need one more than you think
If people call to ask what you charge, they are asking because it is not written down anywhere. Every one of those calls costs you five minutes and costs them the small friction that makes some people not bother.
If you are ever compared against a competitor, the comparison happens on phones, at night, and whoever looks more legitimate wins. That is not fair, and it is what happens.
If you want to be found by people who do not already know your name, you need something for Google to point at. A Business Profile helps and it is not enough on its own.
The thing I would tell a friend
Get four pages. What you do, what it costs, who you are, how to reach you. Make it load in under two seconds on a phone with one bar of signal in a car park, because that is where it will be read.
Do not get a slideshow. Do not get a chat bot. Do not let anybody sell you a monthly retainer for a five page site that changes twice a year.
And put your prices on it, or at least a range. The businesses I work with who did that got fewer enquiries and more customers, which is the trade every one of them wanted.