I think they're fine and should replace cycle solutions wholesale. Our prissy attitudes and regulations should change too. Let eScooters and all kinds of bikes be allowed on paths and town centres. eScooters and bikes should have a speed limit of at least 30mph to not slow down road traffic and a maximum of 5mph on paths and town centres to closely match walking speed. As a car driver is responsible for their own speed so is the eScooter and bike rider.
5 miles per hour is a very fast walking speed.
Mobility scooters that operate on the pavement, and are regulated for safety with regards to speed are limited to a top speed of 4mph (ones designed for road use can go up to 8pmh but IIRC have to have a secondary maximum speed setting for pavements*), and you don't realise how fast 4mph is compared to the average walker until you run the scooter alongside people or are on the scooter and realising that your reasonably fit friends are lagging ever further behind.
The "average" walking speed is 2.5-4mph depending on age, fitness and if you're concentrating on making progress, most people will walk at the lower end of that unless in a hurry.
It's not a "prissy attitude to regulations" to realise that on pavements the priority is the safety and wellbeing of pedestrians, and that includes people who may be unable to move quickly, people with visual or audio impairments and people who may not be paying full attention to everything around them because for example they're not expecting some plonker to come whizzing past them at what is effectively a jog/run.
It's also not prissy to realise that most of the electric scooters available are extremely poorly suited to for example road use or higher speeds because they've not got and real safety features and their wheels are small enough to mean that you're far more likely to have an accident due to a poor surface than bikes or any legal motorised transport. Most bikers will have tales about how bad the roads are for bikes and motorbikes and how the wheel size makes a big difference in handling, and these are people who have actually had training not just bought something and gone straight onto the road.
As an aside even with 4 wheeled mobility scooters they tend to have larger wheels than many of the escooters, because once again they have to meet those prissy safety regs and the people that came up with them are very aware that the smaller the wheel the less it's able to cope with poor conditions, and even the smallest mobility scooter wheel for "outside" (pavement) use I've seen** is larger than some of the ones i've seen on escooters whizzing around (the legal escooters tend to have something akin to the tyres common on many of the smaller mobility scooters).
*Usually something along the lines of a finger operated paddle/lever on the handles for general speed from 0 to whatever, then a secondary dial or switch that controls the maximum the hand control can get to up to the legal limit for it's class (IE you set the dial at half and at maximum pull of the finger lever you go at half the speed that the scooter is hard limited to).
**Over the last 30 years I've seen loads as my mum used them, and the smallest/worst wheel I saw was about 5" on a scooter that was only really meant for inside and in shopping centres, around 8" diameter by 3" wide seems to be the most common "small" one used, whilst 10"+ are more common for road legal ones. The largest I've seen where some mountain bike tyres used on one of my mum's 3 wheelers, really easy to fix (you could buy the tubes and tyres anywhere) but also more prone to damage.