@Mike Clark .....unless the 2021 Yamaha you are looking at has a significant "must have" it looks to me like you have already created your perfect boat.
Other than a gel coat chip on mine (getting repaired in a week or so, obviously under warranty) I have had no issues whatsoever. That said I have owned many, many boats - about half used and half new. The used boats I purchased knowing they may have been beaten-up and some were - the worst issues being improper break-in of the engines.
The boats I bought new were to done to get features that were not available on used boats and when spending a significant more amount of money to ensure they would last because I got to break-in all systems. My 2020 SX195 is of no less quality than any boat in its price range I have seen and a lot better quality than some. I have purchased brand new I/O boats from well-know builders and have had multiple trips to the dealer for poor workmanship issues.
Electronics on the new Yamaha Connext is mentioned n- so far I have been lucky BUT I have had cruisers with touch screen systems units (Ray Marine, garmin and Vessel View), drive by wire, Axius guidance (requiring 3 gps units), radar, satellite Tvs etc.etc. .....talk about electrical issues - and those issues were on boats well into six figure purchase prices. You'd expect to have very few warranty issue on a 400K boat, right? OH MAN!!!!! As well, all manufacturers have quirks: some will install brass through hulls others plastic.
For me switching to jets was about safety for my grandchildren, lower maintenance costs and the ability to get into the skinny water of coves, bays and rivers. The safety and low draft are obvious..... the maintenance might not be. IMO Yamaha engines are the most reliable in the world. When I travel to foreign destinations to scuba dive and explore it's Yamaha everywhere. Yamaha also owns the jet ski rental market.
I have owned OMC Cobra, Volvo Penta and Mercruiser "engines" I do not believe any of them approached the longevity and quality of a Yamaha engine. I'm too new to the jet pump hardware part of the drivetrain ownership to be authoritative yet - but my 160mm jet pump looks simple, easy to work on and robust. I had no issues with the 160mm pump on my 2018 SVHO FX Cruiser. That was not the case with the many, many I/O drives I have owned: dog clutch shim/cone clutch shifting and wear issues, bearing failures, corrosion, leaking drive lube, trim/tilt gremlins, underwater strikes, lack of safety......so far my purchase of this Yamaha looks like a really, really good play.
As far as maintenance - based on two years of owning, first a 2018 Yamaha SVHO FX Cruiser and now the 2020 SX195 the cost of maintenance is a TOTAL JOKE compared with owning and I/O boat. Cruising and I/O boating forums (I have almost 7K posts on one) are continuously full of members experiencing problems with boats. Whatever jet boat drive issues may arise it is my opinion that I/O owners have waaaay more to contend with. Then there's the interior room and swim platforms of our Yammies - NO I/O can touch that!