If a ps5 is $500, and a decent TV is $300, you could build a PC for $800 that will serve you for years and years. When a console becomes obsolete every piece of it becomes worthless. When a PC becomes obsolete every piece of it except the graphics card and processor will continue to be useful. In 5 years it will be far cheaper to upgrade an $800 budget gaming PC than it will be to purchase the PS6. A gaming PC is an investment, a console is a an expensive piece of hardware that will do what you need for 5 years or so, then become an expensive piece of trash.
Add to this the savings you will have by investing in steam games instead of proprietary console games. You already own a steam deck and have probably spent hundreds of dollars on games on steam. If you buy a PlayStation you will start from scratch buying PlayStation games. If you build a PC you will have a full game library on the day you turn it on which you have already paid for.
OP stated they would have to buy a Tv if they bought a console.