The Dark Lord of the Sith's spirit was summoned from the netherworld of the Force to populate a clone body, which led to the creation of Supreme Leader Snoke. It is possible that Obi-Wan's Jedi tomb is connected to all the different stories being told in the other Disney+ TV shows. He found a tomb to the fallen Jedi, with the Sith preserving those who were killed by the clone troopers, and any Jedi subsequently tracked down and killed by the Inquisitors. The Observatory on Jakku was designed to help him figure out how to navigate the Outer Rim, and it was possibly the key to the rediscovery of the ancient Sith redoubt of Exegol.
The Clone Wars were designed by Darth Sidious to be the ultimate Jedi trap, and they ended in Order 66, when clone troopers turned on their Jedi generals. The Emperor would be delighted at the idea that his enemies were continuing to serve his purposes even after he died. Darth Vader was sent there in Star Wars: Episode III - Revenge of the Sith, hoping he could grow there because of the dark side history of Mustafar. The Imperial clone engineers would not be able to conduct experiments related to the Force there without samples to work on, and Palpatine would be unwilling to allow them to start work on his own genetic code. It's easy to imagine the Fortress Inquisitorius as a Palpatine base, with the tomb storing the bodies of the fallen Jedi at his command.
The tomb where dead Jedi were kept is believed to be connected to the Empire's genetic experiments. He may have decided to build a Jedi tomb so the bodies of the Jedi could be used for this purpose. The plan to transfer his spirit into the body of the Chosen One was changed after Darth Vader's body was damaged in his first battle with Obi-Wan. Snoke was a strandcast, an artificial genetic construct created as a host for Palpatine's spirit, but the dark side corrupted Snoke's body, making him an unsatisfactory host for the Emperor. The idea of cloning proved difficult when it came to the Force.
Emperor Palpatine did not want his Empire to be passed on to a successor.
The Imperial cloning facility on Wayland was introduced in the first season of Star Wars: The Bad Batch. The dark side weakens Palpatine's clone so much that he couldn't leave Exegol until he found a new home. Chuck Wendig's trilogy implied that after he killed Darth Plagueis and became chancellor in Star Wars: Episode I - The Phantom Menace, he began constructing some of these. It's possible that the Imperial cloning facility on Wayland was in Star Wars: The Bad Batch. Although that particular plan did not work out the way he wanted, he eventually fixed his gaze upon his own granddaughter, Rey. He wanted to locate Leia Organa, who was kidnapped by the Inquisitors and was about to be tortured for information on the Path. It's easy to imagine Palpatine going to Fortress Inquisitorius to celebrate his victory over them once again.
Each of the safe-houses built by Palpatine had a dark purpose in his mind. It would be smart to include Supreme Leader Snoke in the Star Wars story. The droid manufacturing plant on Valtine was designed to play a specific purpose in his plans.