Often as different benefits have different qualifying conditions. But the larger point against means testing (IMO) is that universal benefits are far less likely to be attacked and devalued over time. If something is just given to a small section of society, often a relatively powerless one, it is easy for politicians on the right to scrap that benefit or daemonize those who receive it. On the other hand universal benefits (like this one) see huge pushback when politicians try to take them away.

The better path forward is to make benefits universal, but make them taxable income and raise higher rates of income tax, that way most of the money given to higher earners naturally flows back to the treasury.