Make poe1 crossplatform as poe2, it is possible

I enjoy poe1 for almost 8 years but after the release of poe2 and its capabilities for crossplatform play I feel that there is no real reason keeping poe1 locked between consoles and PC.
Poe2 gave me the ability to play with my friends and enjoy the mostly stable economy. We are all aware of the fraction of playerbase on PS ( cant speak for xbox with the withdraw of people of the console itself) and the huge amount in PC. This makes it possible for everyone to enjoy every aspect, including playing with friends as said, more affordable market prices, more experimentation and overall more fun.

So, what is the reason that poe1 cannot evolve into a crossplatform game? I understand the amount of work and resources behind that but it is possible. The MTX markets are separate so it doesnt hurt the support of the devs. Furthermore, this will bring a lot more players, who didnt think of ever trying or continuing with the game because of that limitation.