We have gradually been replacing our bulbs with Philips HUE and have never looked back. Just purchase a couple a month and it won't take too long. Most of our bulbs are the Ambiance White (no colors) with some color bulbs strategically placed, which helps a little with cost. Recently, we started replacing the ceiling spots in the kitchen for longevity, as replacing bulbs up there (9) is a pain due to having to get out a tall ladder for the 11' ceilings......likewise, ceiling fan lights will be next. Saying "Siri, please turn on the upstairs Hall lights as I'm going upstairs at night, is really nice for safety.......(or if I'm carrying laundry, a bowl of ice cream, or popcorn....just sayin)

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It's awesome to tell Siri to unlock the door (Schlage) and
turn on the front hall lights when I'm carrying bags in from the car, or most recently, two wiggly 12 lb dachshunds into the house after a vet visit. It's great to be able to change the thermostats (2 systems) (Ecobee4) or Hue lights upstairs or downstairs when on the other floor. With the HomePod, now, it isn't even be necessary to get out my phone and I can add music whenever/wherever. Priceless.
However, we are sticking to HomeKit devices for reliability, compatibility, and b/c we don't want multiple manufacturer's hubs all over the office or different apps that we have to access. The point is to make your life easier.
Don't hesitate to start with HUE. Philips is a quality manufacturer that is poised to continue in the smart bulb business and improving/adding to their product lines. Be aware that there are some cheaper, poor quality knockoffs out there and check the generation of the bulb you are buying to be sure it's the latest since you'll be living with them for 10+ years. Enjoy!
PS: we do just leave the old switches in the "on" position and daily communication/control is simply between the Philips Hue app and the bulbs.