Hello, I was planning to buy the S4 Max because I’ve seen people say the s5 and s6 series were the exact same except they had mops on them and I do not want the mop function. However, it seems to be discontinued on amazon. I have only tiles and hardwood on my floor and it’s about 1.2k sq ft and it gets a lot of dirt traffic and is also a kitchen/dining floor. Which robot should I get? Also, these robots are future proof as in updates right? I don’t want to buy a robot and like 3 years later it stops working.