I have LPA finances and property set up for my parents, who are FAR from
Needing it yet. I don't know any professionals in the field of social care or health who wouldn't think this is a good idea.
You don't need to use it on their behalf, until they no longer can manage their money, but if already set up it stays dormant for years -but you can use it if they ask you to step in for them with their consent on specific things whilst they do have capacity- and they've effectively told the state who they trust to ensure their bills are paid and lives can be led when they can't pay for things.
The alternative is should parent have a stroke or serious health episode affecting their memory, no one has legal authority to manage their money.
It can take 4-12 months to get deputyship in finances (which is what you apply for after capacity has been lost). Far more expensive and all that time none of their bills (not already on DD) are being paid (no cheaper ultilities can be sought, ultilities can over charge you with no one able to complain) and they could be wracking up debts cut off etc with no one lawfully able to step in whilst waiting for legal deputyship.
It is very sensible and inexpensive set LPAs up early in readiness to be used by trusted relatives or friends when you may need it.
If they never do need it, they haven't lost anything and nothing will change as they stay in charge of their money and assets, as they have capacity to do so, you only step in to do what they would want if they lose capacity.
Remind them to do 'joint and severally' LPA (never ' joint but not severally'- that's a nightmare in practice) if they have more than one person named as an LPA.
Also it is auditable by Office public guardian, so you have to act in their best interests.