On the contrary, I believe Israel feels a reasonable deal down the line can be done with the Palestinian Authority.
Without Hamas interfering.
Security cooperation with Israel has been a central pillar of the Oslo process since 1993. The Palestinian Authority view it as very important to their party which is one suggestion they cancelled the 2021 election in the West Bank after polls indicated Hamas would win. For example:
www.timesofisrael.com/abbas-vows-to-uphold-sacred-security-coordination-with-israel/
That means more chance of doing a deal with Palestinian Authority than is ever going to be possible with Hamas backed by Iran.
It's in Israel and the United States' interest to ensure the Palestinian Authority does not collapse. Its also in Palestinian Authority's interests.
Hence Sunak meeting Abbas.
With Hamas off the scene, Abbas won't need to attempt to reconcile with Hamas and can get on with the politics "art of the possible".
Again, very important to take Hamas out as a player.