In my zone no ftth at the moment, but I'm start to "prepare" myself for when they cover my zone.
I read somewhere is necessary only a pc to connect directly to the ONT using a pppoe connection with a nic which support vlan.
Is really ad described? Will be a great news for me because I can choose a router maybe recycling an old pc or a pc which can act as router and nas.
This entirely depends on the ISP -- some use PPPoE, some use DHCP, a few might use static IPs (this is uncommon, though, for residential connections). Likewise, some use VLANs and some don't.
With that said, any device that can run OpenWrt will be able to be configured with VLANs if needed and PPPoE or DHCP (or Static).
The choice of router hardware largely depends on your needs (for example, how many ports, wifi nor wired-only for your main router, etc.), your internet speed from the ISP, your budget (both for the hardware itself and you should consider cost of the energy -- and environmental -- to run the device), and your location around the world. A secondary consideration might be the need for an SFP cage if your ISP doesn't provide you with an ONT that converts the fiber optic to ethernet and/or if you need to run 10G Ethernet ports or fiber within your home to another switch, etc..
In my case, I have 10Gbps symmetric FTTH. The ISP doesn't use VLANs and the connection protocol is DHCP. And my ISP provides an ONT that converts their fiber line to 10G Ethernet for connection to my own router.
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Connectivity totally depends on the provider. Some provide dhcp and dhcp6 on ethernet port, some force you to terminat vlan and ppp and dslite.
If you don't know when FTTH will be available, don't rush and buy something that in a couple of months might be cheaper, or with the same amount of money you can buy something more value for money.
I will suggest that you do your research and not pull the trigger until you have a date.
About your question, if the PC will be used only as a router, you have to consider also the power consumption. Usually, the old systems idle a lot higher than ARM systems.
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Or wait a year and get wifi7 fully working...
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With the long times of my zone I can wait also 10years 
Then plan for wifi8
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