Wrong
1. If you are stuck in pal regions many older games are 50hz, emulation is a easy way around this
2. Cost is cheaper, even if you own a PS2 and a good CRT, you still need buy games some of which are now very expensive or you need buy a harddrive or DVD-rs, with PC or steam deck you don't have that extra costs.
3. Can play at higher res making the games look better, and most emus also support texture replacements now. This just out right looks better especially so with newer TVs
4. Emus like Duckstation can do geometry correction, something the OG PS1 was unable to do
5. Save sates
6. With steam deck playable on the go
7. Faster Loading times
8. Widescreen mods, which work very well with PS2 and Gamecube games, and something you would expect if the games were ever remastered.
9. Can fix frame rate issues the old games may have had
10. Many emus let you speed the game up, which is great when you are hit with an unskippable cutscene or if you are grinding in a RPG
If you want a more accurate experience then sure original console with a CRT is the best way to go, and are the rare games that just not work well on emulation.