I've been gas registered for 30yrs. The FB gas chat group for registered installers are constantly bitching about Ideal boilers. Our company wouldn't touch them with a barge pole for an installation. If you want a cheap boiler, designed on the cheap, then that's fine. Otherwise invest in something better.
Nothing is going to change anytime soon, so correctly fitting a combi is a perfectly fine and efficient solution for the expected lifespan of the appliance. And in 10 to 15 years time, I'm sure tech will be better with the greener/efficient alternatives, to then look into those systems, without having to rush in now and make do with the installation requirements and comfort levels.